Juma bought a TV set at sh. 18000 after being allowed a 10% discount. What was the marked price of the TV set?
Let x be the marked price of the TV set.
After a 10% discount, the price Juma paid is 90% of the marked price:
0.90x = sh. 18000
Dividing both sides by 0.90:
x = sh. 18000 / 0.90
x = sh. 20000
Therefore, the marked price of the TV set was sh. 20000.