Solution to

Suppose jellybeans cost
||content||
.99 per pound and you bought exactly a

Frame 3-21.

quarter-pound (0.25 pounds). How much money should you give the

clerk? [Assume that there is no tax on the purchase.]

round (off)

1.99 (2 decimal places)

0.25 (2 decimal places)

9 95

39 8

49 75 (4 decimal places)

The answer is

||content||

.4975 . If you had changed
||content||
.99 into pennies whenyou started, then you would owe 49.75 (49 3/4) pennies. You could take

a penny, divide it into four equal parts, and give the clerk three of them

(along with the 49), but I don't think the clerk will be very happy.

Instead, we usually round the cost to the nearest penny. That means

||content||

.4975 will be rounded to the nearestof a dollar

(penny or cent).

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Solution to

In the previous example, you will pay either

||content||

.49 or
||content||

.50 (the amountFrame 3-22.

just below the calculated true price and the amount just above the

calculated true price). Look at the number line drawn below.

hundredth

||content||

.49
||content||

.4975
||content||

.50∇

♦

∇

Is 0.4975 (♦) closer to 0.49 or 0.50?

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MD0900

3-11

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