Question #8a080

1 Answer
Jan 31, 2018

$27 or $63$27or$63

Explanation:

In this problem, $90=100$90=100, therefore we need to find 30%30% and subtract it from the original to get the discount price of 70%70% of the original. An easy way to find 30%30% is to find 10%10% by dividing the original amount by 100100, then multiplying by 33.

100%=$90100%=$90

As 100/10=1010010=10, we can divide by 100100 to find 10%10%

90/10=$99010=$9

Therefore 10%=910%=9

As we want to find 30%30%, we need to find out how many times 1010 goes into 3030

30/10=33010=3 Therefore we need to multiply the 10%10% we found by 33

$9 xx 3=$27$9×3=$27 This is therefore 30%30% of the original amount.

If you wanted the amount of the discount, the answer is color(red)($27)$27

But this isn't it, we found 30%30% but we want 70%70% of the original amount, so we minus the answer we have from the original:

$90-$27=$63$90$27=$63

This is like saying

100%-30%=70%100%30%=70% which is the value we want.

therefore discounted price=color(red)($63

If you wanted the price after discount the answer is $63