Can someone answer and explain please ill mark brainliest

Find the balance at the end of 4 years if 1000 is deposited at the rate of

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much