$1.$ Donald purchased a television set at RMX based on an installment scheme at Trexx Sdn Bhd$.$ He paid RM$111$ as a down payment. The shop charged him an interest of $3\mathrm{.}33\%$ per annum based on original balance. He has to pay RM$222$ per month for $2$ years. Determine X$,$ if X is a cash price. $(7$ marks$)$

$2.$ A man purchased a car selling for RM$12,750$ cash by making instalment payments. If he was charged $4\%$ based on the reducing balance and the total interest paid was RM$1,041\mathrm{.}25,$ calculate the number of monthly payments he had made by using the Constant Ratio formula. $(6$ marks$)$