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Some high school students want to collect eight million pennies for charity. How many dollars is that?

Guest May 22, 2017
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$$80000$$

This problem is fairly simple, actually. You can set up a proportion. As a reference, 100 pennies is the equivalent of one dollar:

$$\frac{100pennies}{1}=\frac{8000000pennies}{x}$$

Cross multiply to solve the proportion:

$$100x=8000000$$

Finally, divide by 100 on both sides to isolate x:

$$x=80000$$  And of course, leave the units in your final answer!

TheXSquaredFactor  May 22, 2017