Correct option :
Steps to derive correct option :
Money Maria borrowed = $3000
Percentage of simple interest per annum = 4%
Time she took to repay the money she borrowed = 4 years
We know that :
In this case :
Principal = $3000
Rate = 4%
Time = 4 years
Which means. the simple interest :
Thus, the interest she has to pay = $480
We know that :
Then, the Amount Maria has to pay :
Thus, the amount Maria has to repay after 4 years = $3480
Therefore, the correct option is (b) $3480