3. $10\% (123) + 10\% (123.4) + 1\% (123)$
a. 24
b. 25.46
c. 25.87
d. 24.86
Answer: C
Explanation:
$10\% (123) + 10\% (123.4) + 1\% (123)$
$\require{cancel}=\dfrac{\cancel{10}}{\cancel{100}^{10}} \times 123$ + $\require{cancel}\dfrac{\cancel{10}}{\cancel{100}^{10}} \times 123.4$ + $\require{cancel}\dfrac{{1}}{{100}} \times 123.4$
$= 12.3 + 12.34 + 1.23$
$= 25.87$ Note: If you want to find 10% of a number, keep the decimal point one place from the right for integers. If the given number is in decimal format, shift the decimal point one place to the left.
4. $25$ is what percent of $75$?
a. $33\dfrac{1}{3}\% $
b. $25\% $
c. $14.28\%$
d. $20\%$
6. $200\% $ of $5\%$ of $50 = $
a. 50
b. 5
c. 10
d. 25
Answer: B
Explanation:
$\therefore \dfrac{{200}}{{100}} \times \dfrac{5}{{100}} \times 50 = 5$ Note: 200% means two times of the original number. Thus, 200% of 5% becomes 10%. Therefore, 10% of 50 = 5
