Question

10. By what per cent above the cost price should a dealer mark a pen so that after allow discount of 4% he gains 20%?​

Answer 1

Answer:

25%

Step-by-step explanation:

in competitive exams, a formula is used whenever this type of questions are asked to answer that question quickly and with accuracy.

the formula is:

100-discount : 100+ profilt

100-4: 100+20

96 : 120

4:5

here is the tricky part

if you have to make profile then you have to sell after discount as orginal so ... first portion of that ratio must be 100... I mean 4 must be 100

100 is 25 times more 4 .. so in second portion of ratio, 25*5=125

so above 25% the cost price should be .