Question

if the cost price of the article is 30% of the selling price. what percentage of cost price is the selling price.
A- 230%
B- 70%
C- 330%
D- 130%

Answer 1

cost = .30 * selling price

1/.30 = 3.33

So, 3.33 * cost = selling price

Answer is 333% which is almost answer C

Answer 2

hmm why do you divide 1 by .33

Answer 3

when you see the % symbol, immediately divide by 100

Answer 4

Let c = cost price, s = selling price

c = 30% * s = 30/100 * s = 0.3 * s

now you want to solve
Translate the english into algebra
"what percentage of the cost price is the sales price"
the percentage is unknown, call it x ,

x % * c = s
x/100 * c = s

solve for x
100 s = x *c
100 s / c

substitute c = .30 * s

100 s / (.30 s ) = x

cancel s

100 / .30 = x

x = 333.33 %

Answer 5

wolf1728 thanks yes its right