Answer:
a. $25.075
b. $518.85
Explanation:
Printed price=$450
Downpayment=15% of $450=$(15*450)/100
=$67.50
Remaining money to be paid=$(450-67.50)=$382.50
Convert 18 months into years=18/12=3/2 years
Simple interest for 18 months at the rate of 12% per annum=$(382.5*12*3)/(100*2)=$68.85
Remaining money to be paid along with interest=$(382.5+68.85)=$451.35
a. Monthly installment=$(451.35/18)=$25.075
b. Total amount paid for the printer=$(67.50+451.35)=$518.85