math
posted by stacy .
the sign reads: receive a $10 gift card for every $50 spent.
1) If your reward is $10, what do you know about the amount of your purchase?
2) Give three possible amounts if your reward is $20.
3) What should you do if your total purchase is $98? Explian answer.

You get: $10 / $50 = 1/5 = 0.20 = 20%
of the amount spent.
1. 10 = 0.2S,
S = 10 / 0.2 = $50 Spent.
2. 20 = 0.2A,
A = 20 / 0.2 = $100.
I can give only one amount.
3. Reward = 0.2 * $98 = 19.60.
5
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