Answer:
Explanation:
I am not sure why there is no interest rate given as it is common that there will be an interest charge for a monthly installment plan.
Assuming it is an interest-free plan, the remainder payment is for an amount of:
680000*(1 - 12.5%)
= 680000*(0.875)
= 595000 naira
Dividing that into 12 equal monthly, each monthly installment is
595000/12 = 49583.33
~49583 naira