What is 15 percent of 34

Answer: Option A

Explanation:

Let the number be x,
then,
$$\begin{aligned} \frac{5}{3} - \frac{3}{5} = \frac{16}{15}x \end{aligned}$$

Error% = $$\begin{aligned} (\frac{16}{15}x * \frac{3}{5} * 100)% = 64% \end{aligned}$$

Answer: Option A

Explanation:

Actual Price = Rs.25 + Rs.2.50 = Rs.27.5

Saving = Rs.2.5

$$\begin{aligned}\text{Percentage Saving = }\dfrac{2.5}{27.5}\times 100 \\ = \dfrac{250}{27.5} = \dfrac{2500}{275}\\ = \dfrac{100}{11} = 9\dfrac{1}{11}\% \approx 9\%\end{aligned}$$

Answer: Option C

Answer: Option D

Explanation:

It will be 1/2(1%) = 1/2(1/100) = 1/200 = 0.005

Answer: Option C

Explanation:

Error = (81.5 - 81.472) = 0.028
Required percentage = $$\begin{aligned} \frac{0.028}{81.472} \times 100 = 0.034 % \end{aligned}$$