Solve for S_8
S_{8}=313.6
Assign S_8
S_{8}≔313.6
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S_{8}=\frac{8\times 78.4}{2}
Add 4.9 and 73.5 to get 78.4.
S_{8}=\frac{627.2}{2}
Multiply 8 and 78.4 to get 627.2.
S_{8}=\frac{6272}{20}
Expand \frac{627.2}{2} by multiplying both numerator and the denominator by 10.
S_{8}=\frac{1568}{5}
Reduce the fraction \frac{6272}{20} to lowest terms by extracting and canceling out 4.
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