Question

9. The price of an article is cut 10%. To restore it
to its former value, the new price must be
increased by:
(a) 10%
(b) 9%
(d) 11%
(c) 11%​

Answer 1

Answer:

helped

Let a number be 100

Its decreased by 10%= 100- (10/100×100)

= 90

Let the increase % be x

90+(x/100×90)= 100

90+ 90x/100

90x/100= 100-90

x= 10×100/90

x= 100/9 % or 11 whole 1 by 9 %

Hope it helps☺

Answer 2

Answer:

Let a number be 100 it's decreased by 10%=100-(10/100×100)

=90

Let the increase % be X

90+(X/100×90)=100

90+90×/100

90x/100=100-90

X=10×100/90

X=100/9%or 11 whole 1 by 9%