Answer:
a) The interest charged on the loan can be calculated as:Interest = Principal x Rate x Time
= $27,000 x 0.04 x 3
= $3,240Therefore, Amy has to pay $3,240 in interest over the 3-year loan period.(b) The total amount to be repaid at the end of the loan period can be calculated as:Total amount = Principal + Interest
= $27,000 + $3,240
= $30,240To calculate the monthly installment, we need to divide the total amount by the number of months in the loan period. Since there are 3 years in the loan period, which is equal to 36 months, the monthly installment can be calculated as:Monthly installment = Total amount / Number of months
= $30,240 / 36
= $840Therefore, Amy has to pay $840 per month as the installment for her loan.