$$21748 2 \frac { 1 } { 2 } 7 \frac { 1 } { 2 } \%$$
$\frac{16311}{4}=4077.75$
$$21748\times \frac{4+1}{2}\times \frac{\frac{7\times 2+1}{2}}{100}$$
$$21748\times \frac{5}{2}\times \frac{\frac{7\times 2+1}{2}}{100}$$
$$\frac{21748\times 5}{2}\times \frac{\frac{7\times 2+1}{2}}{100}$$
$$\frac{108740}{2}\times \frac{\frac{7\times 2+1}{2}}{100}$$
$$54370\times \frac{\frac{7\times 2+1}{2}}{100}$$
$$54370\times \frac{7\times 2+1}{2\times 100}$$
$$54370\times \frac{14+1}{2\times 100}$$
$$54370\times \frac{15}{2\times 100}$$
$$54370\times \frac{15}{200}$$
$$54370\times \frac{3}{40}$$
$$\frac{54370\times 3}{40}$$
$$\frac{163110}{40}$$
$$\frac{16311}{4}$$
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$\frac{3 \cdot 5437}{2 ^ {2}} = 4077\frac{3}{4} = 4077.75$
