Question

X sold an article to Y at a gain of 10%.Y sold it to Z at a gain of 20%.If Z paid Rs.2640 for it, what did it cost to X?

Answer 1

cp of y = 100/100+gain×sp
cp= 100/100+20×2640
100/120×2640
22×100
sp of x=2200
cp =100/100+10×2200
100×20
2000