A store is having a 20%-off sale on all merchandise.
a) If Mai buys one item and saves $13, what was the original price of her purchase? and explain

This is easy . There is a 20 percent discount which means now it’s only (100-20%) discount.
This is 80% discount.
Money saved is equal to 100-80%
=20%
And that 20% is equal to 13$ as per the passage.
So now we need to calculate 1 percent of the item without discount .
This is equal to 13/20
This is equal to .65
Now to find the original price you will need to multiply .65 to 100 this is equal to 65$.

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A store is having a 20%-off sale on all merchandise.a) If Mai buys one item and saves $13, what was the original price of her purchase?​ and explain

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A store is having a 20%-off sale on all merchandise.
a) If Mai buys one item and saves $13, what was the original price of her purchase? and explain