The original price of a car is entered into spreadsheet cell A$1$ and the annual depreciation amount in cell B$1.($Remember to include an $=$ symbol in the formula.$)$

a$.$ Write the spreadsheet formula to determine the number of years it will take for the car to totally depreciate.

b$.$ The spreadsheet user is instructed to enter a car value in cell D$1.$ Write the spreadsheet formula to compute how long it will take for the car to depreciate to that value.

c$.$ The spreadsheet user is instructed to enter a percent into cell E$1.$ Write the spreadsheet formula to compute the length of time it will take for the car to decrease by that percent.