Using the rate, they both are of the same value.
How to use rate to find the better deal ?
A rate is a relationship between two different types of units.
Therefore, the rates can be use to find the card with better value.
He can buy a 200 point card for 10 dollars.
Therefore,
rate = 200 / 10
rate = 20 point card per dollars
He can also buy a 300 point card for 15 dollars.
Therefore,
rate = 300 / 15
rate = 20 point card per dollars.
Therefore, they both are of the same value.
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