After deducting 10 percent from a certain sum and then deducting 70 percent from the remainder, 1188 is left. What was that sum?

Correct option is C

Given:
Final amount left = ₹1188
First deduction = 10%
Second deduction = 70%
Solution:

Let the original sum be x.
After first deduction: Remaining amount = 0.90 × x
After second deduction: Remaining amount = 0.30 × 0.90 × x = 0.27x
0.27x = 1188
x = 1188 / 0.27 = ₹4400
Therefore, the original sum was ₹4400.