Lf a shopkeeper buys a pen rs.5 and sells it at rs.4 find his profit o

1.	Lf a shopkeeper buys a pen rs.5 and sells it at rs.4 find his profit or loss persentage
Answer» Step-by-step explanation: CONSIDER RS. x as the C.P. of 7 pens C.P. of 1 pen =Rs.x/7 Based on the question S.P. of 5 pens =Rs.x S.P. of 1 pen =Rs.x/5 Profit=S.P.–C.P. Substituting the values =x/7–x/5 Taking LCM =(7x–5x)/35 =Rs.2x/35 We KNOW that Profit%=Profit/C.P.×100% Substituting the values = x/7 2x/35 ×100 % It can be written as =2x/35×7/x×100 % By further calculation =2/5×100 % So we get =2×20 % =40 %

Lf a shopkeeper buys a pen rs.5 and sells it at rs.4 find his profit or loss persentage

Answer»

Step-by-step explanation:

CONSIDER RS. x as the C.P. of 7 pens

C.P. of 1 pen =Rs.x/7

Based on the question

S.P. of 5 pens =Rs.x

S.P. of 1 pen =Rs.x/5

Profit=S.P.–C.P.

Substituting the values

=x/7–x/5

Taking LCM

=(7x–5x)/35

=Rs.2x/35

We KNOW that

Profit%=Profit/C.P.×100%

Substituting the values

x/7

2x/35

×100 %

It can be written as

=2x/35×7/x×100 %

By further calculation

=2/5×100 %

So we get

=2×20 %

=40 %