A trader paid import duty of 38 kobo in the naira on the cost of an engine. If a total of ₦22,800.00 was paid as import duty, calculate the cost of the engine.
Worked solution (try it first)
100 kobo make ₦1, so 38 kobo in the naira means a duty of ₦0.38 on every ₦1 of cost: duty =0.38C.