A number increased by 30% gives 780. The number is
Choose the correct choice:
A) 250
B) 400
C) 450
D) 600
E) 520

Rationale: "formula = total = 100 % , increse = ` ` + ' ' decrease = ` ` - ' ' a number means = 100 % that same number increased by 30 % = 130 % 130 % - - - - - - - > 780 ( 130 × 6 = 780 ) 100 % - - - - - - - > 600 ( 100 × 6 = 600 ) d )"
Answer: D