Question

a mobile phone is sold for #₹8400 at a gain of 20%. the cost of the mobile phone is​

Answer 1

Step-by-step explanation:

S.Pof phone=8400

Gain=20%

C.P=?

C.P=S.P( 100/100 + gain)

C.P=8400(100/100+20)

=8400×100/120

=21000/3

7000

Answer 2

selling price= 8400(by 20% gain)

8400= 120%

find 100% for cost of mobile phone

by finding percentage formula,

8400 = x

120% 100%

( by cross multiple)

• 100×8400 = x × 120
• 840000. = x × 120
• 840000/120 = x
• x = 7000