Question

from 2010 to 2011,the sales of watch decreased by 80%.If the sales in 2012 was the same as in 2010 then what per cent did it increase from 2011 to 2012​

Answer 1

$Let \: Sale \: in \: 2010 \: =100$

$let \: sale \: in \: \: 2011 = \: 80$

$Required \: Increase \: = \frac{100 - 20}{20} \times 100$

$= \frac{80}{20} \times 100$

$= \frac{8000}{20}$

$= 400\%$

Answer 2

Answer:

it increased with a percentage of 43 percent