A marker bought for Rs 50 was sale at a profit of 5%. find the selling price.

Rs52.5

Step-by-step explanation:

Cost price(cp)=Rs50

Percentage profit=5%

Selling price(sp)=?

Percentage profit=(sp-cp) /cp x 100

5=(sp-50)/50 x 100

5 x 50=100(sp-50)

250=100(sp-50)

Sp-50=250/100

sp-50=2.5

sp=2.5+50

sp=52.5

Selling price=Rs52.5

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.