I get an MRI at a Hospital. It costs $1500, but the hospital gives me an option to pay this off in installments. (They do not charge interest). I have two options. (a) Pay off 10 % of the remaining...

I get an MRI at a Hospital. It costs $1500, but the hospital gives me an option to pay this off in installments. (They do not charge interest). I have two options.

(a) Pay off 10 % of the remaining debt each month.

Write a function f(x) which is my debt after x months. Hint: try it after 1 month, 2 months, 3 months. When does my debt reach $100?

(b) Pay off $80 each month.

Write a function g(x) which is my debt after x months. Hint: try it after 1 month, 2 months, 3 months. When does my debt reach $100? When do I pay it off completely?