Answer:
her account will have 1,020 dollars if it is a 5% annual interest rate
Explanation:
850
___ = ___ (cross multiply)
100 5
when you cross multiply you get that 5% is 42.50
multiply 42.50 by 4 (the number of years the money will be in the account)
add that number to the original amount and you get the total after 4 years.