Given:
Cost = $2915
16% per year finance charge
Find-: Each month pay amount
Sol:
The cost of computer software = 2915
The percentage rate of the finance charge per 18 months will be.
Rate of change in 18 month is:

Now the find finance charge:

Installment price = finance charge + cash price
The installment price is:

The installment payment = installment payment / number of payment

So each month payment is 201