9. Define a python function name remain to take two integer parameters and return the remainder when the first integer is divided by the second. Multiple lines of code are required. Indicate indentation where neccesary with a few taps of the SPACEBAR.

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10. number1 = 25

num2 = 7

The two statements above have been coded in main(). Put down more code in main() that executes the remain function from the previous question with num1 and num2 as arguments, and prints the remainder.

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11. A python statement to open a file named data.txt for writing (without erasing any existing content) and assign file as a reference to it.

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12. price = 12.99

refer to the previous question. Put down a state to write variable price to its own line in data.txt.

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13 python statements to open data.txt and read what Question 12 wrote to the file into a variable named unit_price.