A shop advertises 20% off its prices in a sale.
A hat is £36 in the sale.
How much was it before the price reduction?

£45

Step-by-step explanation:

Say the original price is x. When we take 20% off, that's basically multiplying x by 20% and then subtracting that product from the original price, which is x:

x - 20% * x = 80% * x = 0.8x

Now, this equals £36, so we just set them equal:

0.8x = 36

Dividing by 0.8 from both sides, we get:

x = £45

Thus, the answer is £45.

£43.2

Step-by-step explanation:

before discount the price was

120%×36

=£43.2

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.