Question

on a selling a bat for ₹100,a man gains ₹20.His gain% is

Answer 1

so = 100
cp = 100-20 = 80
profit = 20
gain % = 20/80 ×100
= 25%

please follow me

Answer 2

cp = sp - gain \\ 100 - 20 \\ = 80 \\ cp = 80 \\ gain\% = gain \div cp \\ = 20 \div 80 \times 100 \\ gain\% = 25%(text)