$$400OF12 \% +2500OF13 \% =$$
$373FO$
$$400OF\times \frac{3}{25}+2500OF\times \frac{13}{100}$$
$$\frac{400\times 3}{25}OF+2500OF\times \frac{13}{100}$$
$$\frac{1200}{25}OF+2500OF\times \frac{13}{100}$$
$$48OF+2500OF\times \frac{13}{100}$$
$$48OF+\frac{2500\times 13}{100}OF$$
$$48OF+\frac{32500}{100}OF$$
$$48OF+325OF$$
$$373OF$$
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$373F$
