VyshakhR1995 wrote:
Doug's income is 40% of Marko's income and Jon's income is 50% of Doug's income.If Doug's income is $28000 a year,then Marko's income is what percent of Jons's income
A)5%
B)14%
C)20%
D)175%
E)500%
Because answers were far apart and numbers were reasonable, I did it the long way, albeit with some shortcuts. Round up Doug's income and drop 3 zeros for everyone.
Round up, so Doug = 30.
Jon is 50% or half of Doug = 15
Marko? Doug = .40 of Marko =>
30 = \(\frac{4}{10}\) or \(\frac{2}{5}\)
MMultiply both sides by \(\frac{5}{2}\)
\(\frac{5}{2}\)* 30 = ( \(\frac{5}{2}\) * \(\frac{2}{5}\)) M
M = 75
Marko as a percentage of Jon?
\(\frac{75}{15}\) = \(\frac{5}{1}\) = \(\frac{x}{100}\) ==> 500%
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