Answer:
$ 1,620.46
Explanation:
The amount of interest to be saved is the difference between the cash price and the total amount to be paid if the installments option is preferred.
The cash price is $20, 256
The total from installment option will be monthly payments x time taken
=$455.76 x 48
=$21,876.48
Interests to be saved = $21,876.48 - $20, 256
=$ 1,620.46