The price of a jewel, after passing through three merchants rises on the whole by 80%. If the first and the second merchants earned 20% and 25% profit respectively, find the percentage profit earned by the third merchant.
50%
80%
20%
100%
Explanation:
Let initial price is 100 then final will be 180
100---+20%------120
120 ----- +25%----150
150-----+20%-----180.