Question

Decrease the following quantities by $10\%$:

$42,100$watches

Answer 1

Decreasing the quantitty by $10\%$

First find $10\%$ percent of $42,100$, then substract it from $42,100$

$\begin{array}{rcl}10\%\mathrm{of}42,100& =& \frac{10}{100}\times 42100\\ & =& 10\times 421\\ & =& 4210\end{array}$

Now, subtracting $4210$ from $42,100$

$$\begin{gathered} =42100-4210 \\ =37890 \end{gathered}$$

Hence, $37890$ watches is the required answer after reducing $42,100$ watches by $10\%$