A dress is offered at £105 in a 30% sale.
How much does it normally cost?

the answer of the question is $36

£150

Step-by-step explanation:

£105 is the already reduced price. and it is reduced by 30%.

that means that price is 100-30 = 70% of the original price

so, how to get the 100% out of the 70% ?

well, in the same way we do it also in the other direction.

basically, figure out 1%, and then go for how many % we need.

so, we need to divide 105 by 70 (to get 1%) and then multiply the result by 100 (to get 100% out of the 1%).

price = 105/70 × 100 = 105 × 100 / 70 = 105 × 10 / 7 =

= 15 × 10 = £150

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.