Edit typos and grammar and add python files

thinkcspy/Chapter-2-Exercises/Python-Files/problem10.py

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+# Runestone.Academy thinkcspy course
+# Chapter 2
+# Problem 10
+
+miles =  input('How many miles did you drive before refueling?')
+mi = int(miles)
+
+gallons = input('How many gallons did you use to refuel your vehicle?')
+gal = int(gallons)
+
+mpg = mi / gal
+
+print('Your fuel efficiency is', mpg, 'MPG.')

thinkcspy/Chapter-2-Exercises/Python-Files/problem11.py

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+# Runestone.Academy thinkcspy course
+# Chapter 2
+# Problem 11
+
+celcius = input('What is the temperature in degrees celsius?')
+C = int(celcius)
+
+F = (C * 9/5) + 32
+
+print(C, 'degrees celcius is equivalent to', F, 'degrees fahrenheit.')

thinkcspy/Chapter-2-Exercises/Python-Files/problem12.py

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+# Runestone.Academy thinkcspy course
+# Chapter 2
+# Problem 12
+
+fahrenheit = input('What is the temperature in degrees fahrenheit?')
+F = int(fahrenheit)
+
+C = (F - 32) * 5/9
+
+print(F, 'degrees fahrenheit is equivalent to', C, 'degrees celcius.')

thinkcspy/Chapter-2-Exercises/Python-Files/problem3.py

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+# Runestone.Academy thinkcspy course
+# Chapter 2
+# Problem 3
+
+
+currentTime = input('What time is it?')
+currentTime = int(currentTime)
+
+waitTime = input('In how many hours do you need to wake up?')
+waitTime = int(waitTime)
+
+print('It is currently', currentTime,'.')
+print('You need to wake up in', waitTime, 'hours.')
+
+# My solution was more long winded than the actual answer, but it still works!
+totalTime = currentTime + waitTime
+time24hr = totalTime // 24
+alarmTime = totalTime - 24 * time24hr
+
+print('The alarm has been set for', alarmTime, '.')

thinkcspy/Chapter-2-Exercises/Python-Files/problem4.py

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+#5Runestone.Academy thinkcspy course
+# Chapter 2
+# Problem 4
+
+currentDay = input('''Enter the current day using one of the following numbers:
+Sunday    = 0
+Monday    = 1
+Tuesday   = 2
+Wednesday = 3
+Thursday  = 4
+Friday    = 5
+Saturday  = 6''')
+currentDay = int(currentDay)
+
+stayLength = input('How long is your stay?')
+stayLength = int(stayLength)
+
+# Improved upon the long windedness of my answer this time by following the example of the solution 
+# in the previous problem
+stay = currentDay + stayLength
+returnDay = stay % 7
+
+print('It is currently Day', currentDay,'.')
+print('Your stay is ', stayLength, 'days long.')
+print('You will return on Day', returnDay, '.')
+print('''Sunday    = 0
+Monday    = 1
+Tuesday   = 2
+Wednesday = 3
+Thursday  = 4
+Friday    = 5
+Saturday  = 6''')

thinkcspy/Chapter-2-Exercises/Python-Files/problem7.py

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+# Runestone.Academy thinkcspy course
+# Chapter 2
+# Problem 7
+
+P = 10000 
+n = 12
+r = 0.08
+n = 12
+
+# Noticed that they gave separate variables to the inputs problem 3 and
+# the converted ints so decided to do the same here.
+t_string = input('For how many years will your principal be earning interest?')
+t = int(t_string)
+
+A = P*(1+r/n)**(n*t)
+
+print('The final amount after you will earn after', t, 'years is', A)

thinkcspy/Chapter-2-Exercises/Python-Files/problem8.py

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+# Runestone.Academy thinkcspy course
+# Chapter 2
+# Problem 8
+
+r_string = input('Enter the radius of the circle')
+r = int(r_string)
+pi = 3.14
+
+area = pi * r**2
+
+print('The approximate area of the circle with', r, 'radius is', area, '.')

thinkcspy/Chapter-2-Exercises/Python-Files/problem9.py

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+# Runestone.Academy thinkcspy course
+# Chapter 2
+# Problem 9
+
+width = input('What is the width of the rectangle?')
+w = int(width)
+
+height = input('What is the height of the rectangle?')
+h = int(height)
+
+area = w*h
+
+print('The area of the rectangle with a width of', w, 'and a height of', h, 'is', area, '.')