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Nomor 1

$\frac{1}{4} + 28 + 2.3 \\ = 0.25 + 25 + 2.3 \\ = 27.55 \\$

Nomor 2

$4.85 + 3 \frac{2}{5} \\ = 4.85 + 3.4 \\ = 8.25$

Nomor 3

$75.5 + n = 90 \\ n = 90 - 75.5 \\ = 14.5 \\$

Nomor 4

$5.35 - 3 \frac{1}{5} - 75\% \\ = 5.35 - 3.2 - 0.75 \\ =2.15 - 0.75 \\ = 1.4$

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