A municipal committee decides to build 50 housing units for low income families. These housing units come in three types, A, B, and C. Type A units will cost RM500K each to build and will provide the city with revenue from rental payments of the amount RM25K per year. The corresponding numbers for type B units are RM625K and RM30K per year, and the numbers for type C units are RM400K and RM22.5K per year. If the total cost to build the 50 units was RM24, 750,000; and the yearly revenue from rental payments is RM1, 262,500; how many of each type of unit was built by the city?