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MakcuM [25]
3 years ago
11

If 28% of a sum is $100.80, what is the sum?

Mathematics
1 answer:
lbvjy [14]3 years ago
7 0
Call the sum S. Then, you can use the definition of percentage to obtain an equation to find the value of S: 1) 28% = 28 / 100; 2) 28% of x = (28/100)x; 3) that is equal to $100.80 => (28/100)x = 100.8 => x = 100.8 * 100 / 28 => x = 360. You can verify that the 28% of 360 is 100.80: 360 * 28/100 = 100.80. <span>Then, the answer is $360.</span>
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x = 8 ---> subtract 8 from both sides
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This means we use (x -  8) in our factorization. 

You then need to repeat the process until you have all the pieces. In the second problem, there will be 3 instead of 2 since it crosses the axis 3 times. 
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no

Step-by-step explanation:

3.6 + 3.6 is not 9 & 2.84 + 2.84 is not 7.1

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Proportional.

Step-by-step explanation:

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Cross multiply,

1.2 * 4 .5       =         3*1.8

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2 years ago
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