Number 350 is increased by 20% and then decreased by 25%. Find the new number.

Correct option is D

Given:
Number = 350
Increase = 20%
Decrease = 25%
Formula Used:
Percentage increase/decrease =$$\left(\frac{\text{Increased or decreased value}}{\text{Original value}}\right) \times 100$$​​
Solution:
First, Increase the number by 20%, then New Number formed = $$350 + 350 \times \frac{20}{100} = 420$$​​
Then, decrease the new number by 25%, then Again a New Number formed= $$420 - 420 \times \frac{25}{100} = 315$$​
Therefore, the new number is 315.
Alternate Method:

Final Number = $$350 \times \frac{120}{100} \times \frac{75}{100} = 315$$​​