how do i get the hire purchase price for option 1 and option 2

Question

the marked price of the computer is $3000.

if it is bought  cash, a 10% discount is offered  off the marked price.

if the appliance is bought on hire purchase the customer has a choice of two option or repayment plans

option 1                                                                     option 2

no deposit                                                                 deposite $450

monthly instalment = $120                                    monthly instalment $150

3 year repayment plan                                             2 year repayment plan

Answer 1

OPTION 1

3 years = 36 months @ $120 per month

TOTAL $4320

OPTION 2

2 years = 24 months @ $150 per month

TOTAL $450+$3600=$4050

(10% off is $2700)