The length of time you have to pay off the balance before the bank starts charging interest is known as a. grace period b. annual percentage rate c. payment period d. annual fee

The length of time you have to pay off the balance before the bank starts charging interest is known as the- Grace period

A grace period is a period given by the banks to its debtors to pay the loan or debt in a few days after the due date is over. During this period no late fees is  charged and the loan does not get cancelled even if paid lately. This grace period is usually from a week to 2 weeks.

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5

e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation: