If 20% of 35% of a number is 240.8, then 18% of that number (rounded off to 1 decimal place) is:

Correct option is A

Sol. Solution:
Let the number be x.
Set up the equation based on given information:
20%" of " 35%" of " x=240.8
· This translates to:
​$$\frac{20}{100}×\frac{35}{100}×x=240.8$$​​
Solve for x :
0.2×0.35×x=240.8
0.07x=240.8
x= $$\frac{240.8}{0.07}=3440$$​​
Find 18% of x :
​$$18\ \% of x= \frac{18}{100}×3440=619.2$$​​
Answer: (a) 619.2