Question

at 12% discount the selling price of a pen is rupees 13.20 find it selling price also find the new selling price of the fan of the pen if it is sold at 5% discount

Answer 1

$selling \: price \: = 13.20 \times 100 \div 12 = 110 \\ 110 \times 5 \div 100 = 5.5$

Answer 2

let M.P be x,
then discount =(12/100)×x=12x/100
SP=MP-Discount
13.20=x-(12x/100)
13.20=(100x-12x)/100
1320/88=x
x=Rs15
MP=Rs15

For 5% discount
Discount = d% of MP=(5×100)×15=Rs3/4
SP =15-(3/4)= (15×4-3)/4= Rs 57/4= Rs 14.25

Marked Price is Rs 15 AND
selling price is Rs 14.25