$$6 k _ { 50 } 3 \frac { 1 } { 2 } \%$$
$\frac{21k_{50}}{100}$
$$6k_{50}\times \frac{3\times 2+1}{2\times 100}$$
$$6k_{50}\times \frac{6+1}{2\times 100}$$
$$6k_{50}\times \frac{7}{2\times 100}$$
$$6k_{50}\times \frac{7}{200}$$
$$\frac{6\times 7}{200}k_{50}$$
$$\frac{42}{200}k_{50}$$
$$\frac{21}{100}k_{50}$$
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