Find the value of \[R\] rounded off to one decimal place.
A) \[7.8\]
B) \[7.75\]
C) \[7.7\]
D) \[8\]
Correct Answer: A
Solution :
\[7.8+2.4\div 60-0.09=R\] \[7.8+\left( \frac{2.4}{60} \right)-0.09=R\] \[7.8+\left( \frac{24}{600} \right)-0.09=R\] \[7.8+0.04-0.09=R\] \[7.84-0.09=R\] \[\therefore \] \[R=7.75\] Rounding off \[R\] to \[1\] decimal place, we get\[7.8\].
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