If 28% of a sum is $100.80, what is the sum?
A. $129.02
B. $277.78
C. $282.24
D. $360.00
how can i do this
i got the answer it's D thanks
how did you figure out which operation to use.
I thought -- 28% of what is 100.80? -- and then put it in algebraic terms.
To find the sum, we can set up a proportion using the given information.
Let's first express 28% as a decimal by dividing it by 100: 28% = 0.28.
Now we can set up the proportion:
0.28 (part) / x (whole) = $100.80 (part) / y (whole).
Cross multiplying the proportions, we get:
0.28y = $100.80.
To solve for y, divide both sides of the equation by 0.28:
y = $100.80 / 0.28.
Performing the division, we find:
y = $360.
Therefore, the sum is $360.
Looking at the given options, option D. $360.00 matches our calculation.
Change 28% to a decimal. Let x = the sum.
0.28x = 100.8
x = 100.8/0.28
x = ?