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agasfer [191]
4 years ago
5

If one postage stamp costs $0.85, how much does a book of 25 stamps cost?

Mathematics
2 answers:
Vedmedyk [2.9K]4 years ago
8 0

Answer:

$21.25

Step-by-step explanation:

Since one postage stamp is 0.85

0.85*25=21.25

21.25

aniked [119]4 years ago
5 0

Answer: $21.25

Step-by-step explanation:

0.85 x 25

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. We assume, that the number 260 is 100% - because it's the output value of the task.

2. We assume, that x is the value we are looking for.

3. If 260 is 100%, so we can write it down as 260=100%.

4. We know, that x is 6.75% of the output value, so we can write it down as x=6.75%.

5. Now we have two simple equations:

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where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

260/x=100%/6.75%

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

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260/x=100/6.75

(260/x)*x=(100/6.75)*x       - we multiply both sides of the equation by x

260=14.814814814815*x       - we divide both sides of the equation by (14.814814814815) to get x

260/14.814814814815=x

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now we have:

6.75% of 260=17.55

Step-by-step explanation:

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