1. Due to an increase in 30% in the price of eggs, 3 eggs less are available for Rs. 7.80. Find the present rate of eggs per dozen.
Rs. 9.36
Rs. 10.36
Rs. 11.36
Rs. 12.36
Answer: Option A
Explanation:
Let the original price per egg be Rs x
Then increased price will be,
\begin{aligned}
\left(\frac{130}{100}x\right) \\
=> \frac{7.80}{x}-\frac{7.80}{\frac{130}{100}x} = 3\\
=> \frac{7.80}{x}-\frac{780}{130x} = 3 \\
=> 390x = 234 \\
=> x = 0.6 \\
\text{Actual price was Rs 0.6} \\
\text{Present price per dozen will be} \\
Rs.\left(12*\frac{130}{100}*0.6 \right) \\
= Rs. 9.36
\end{aligned}
2. 88% of 370 + 24% of 210 - x = 118
150
250
158
258
Answer: Option D
3. What is 15 percent of 34
5.10
4.10
3.10
2.10
Answer: Option A
Explanation:
It will be 15% of 34
= (15/100) * 34 = 5.10
4. A student multiplied a number by 3/5 instead of 5/3. What is the percentage error.
64%
65%
66%
67%
Answer: Option A
Explanation:
Let the number be x,
then,
\begin{aligned}
\frac{5}{3} - \frac{3}{5} = \frac{16}{15}x
\end{aligned}