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# Plugging In: Invisible Plugging In - Fractions

Calvin spends half of his monthly salary on rent. Three-quarters of his remaining salary is spent on utility bills, groceries, and loan repayment. If he saves half of what he is left with after paying rent, utility bills, groceries, and loan repayment, what fraction of his salary does he save every month?
Incorrect. [[snippet]]
Correct. [[snippet]] __Plug In__ a good number, such as $16 ($$2 \times 4 \times 2$$) for what Calvin earns a month. He spends$8 (half of his salary) on rent, so he is left with $8. He spends$6 ($$\frac{3}{4} \times 8$$) on utility bills, groceries, and loan repayment, so he is left with $2 ($$16 - 8 - 6$$). He saves$1 (half of what he is left with = \$2). Hence, he saves $$\frac{1}{16}$$ of his monthly salary.
Incorrect. [[snippet]]
Incorrect. [[snippet]]
Incorrect. [[snippet]]
$$\frac{1}{32}$$
$$\frac{1}{16}$$
$$\frac{1}{8}$$
$$\frac{1}{4}$$
$$\frac{1}{2}$$