Correct Answer - Option 4 : 80
Given :
A number increased by = 22\(\frac{1}{2}\)%
Result = 98
Calculation :
Let the required number be = a
⇒ a + (45/2)/100 of a = 98
⇒ a + 45/(2 × 100) × a = 98
⇒ a + (9a/40) = 98
⇒ (40a + 9a)/40 = 98
⇒ 49a/40 = 98 (cross multiplication) then,
⇒ 49 a = 98 × 40
⇒ a = (98 × 40)/49
⇒ a = 80
∴ The number is 80