In lease system, interest is calculated on:

Cash down payment
Cash price outstanding
Hire purchase price
None of the above

The correct answer is: C. Hire purchase price.

A hire purchase agreement is a type of installment loan agreement in which the buyer agrees to pay for goods or services in installments over a period of time. The seller retains ownership of the goods until the final installment is paid. Interest is calculated on the hire purchase price, which is the total amount of money that the buyer will pay for the goods or services.

A cash down payment is a sum of money that the buyer pays upfront when they purchase goods or services. The cash down payment reduces the amount of money that the buyer will need to borrow and the amount of interest that they will pay.

The cash price outstanding is the amount of money that the buyer still owes on the goods or services after they have made a cash down payment. The cash price outstanding is calculated by subtracting the cash down payment from the hire purchase price.

None of the above options is correct.