Question

by selling two watch for 780 each ravi gain 20 percent on one and lose 20 percent on other. find gain or loss percent​

Answer 1

Answer:

The end result is a loss of 4%

Step-by-step explanation:

Let a and b the cost prices of the two watches.

Watch 1:

Selling at 780 makes 20% gain

=> 780 is 20% more than a

=> 780 = 1.2 a

=> a = 780 / 1.2 = 650

Watch 2:

Selling at 780 makes 20% loss

=> 780 is 20% less than b

=> 780 = 0.8 b

=> b = 780 / 0.8 = 975

Total cost price was a+b = 650+975 = 1625

Total selling price was 780+780 = 1560

That's a loss of  1625 - 1560 = 65

As a percentage of the cost price:

( 65 / 1625 ) × 100% = 4%

Answer 2

one watch 780.

2 watches 780.

let's suppose cp 100.

if profit then 100+20=120

cp. sp

120. 100

1. 100/120× 780 =650

if lose 100-20 =80

cp. sp

80. 100

1. 80/100×780= 975.

sum of 2 watches 975+650=1625

sum of 2 watches 780+780=1560

cp-sp 1625-1560. =65

65/1625×100. =4%