A washing machine selling for RM800 cash was purchased through an instalment plan in which 10% down payment was made. The buyer made 20 weekly payments of RM40 each to settle the balance. Calculate...

A washing machine selling for RM800 cash was purchased through an instalment plan in which

10% down payment was made. The buyer made 20 weekly payments of RM40 each to settle

the balance. Calculate

(a) the instalment price

(b) the total interest charged

(c) the simple interest rate charged

(d) the effective rate charged.