Follow BODMAS rule to solve this question, as per the order given below, Step-1- Parts of an equation enclosed in 'Brackets' must be solved first, and in the bracket, Step-2- Any mathematical 'Of' or 'Exponent' must be solved next, Step-3- Next, the parts of the equation that contain 'Division' and 'Multiplication' are calculated, Step-4- Last but not least, the parts of the equation that contain 'Addition' and 'Subtraction' should be calculated. Given expression is, 1620 ÷ 36 × 40 + 8.45 ÷ 0.013 = 49% of ? Applying BODMAS Rule; ⇒ 45 × 40 + 650 = 0.49 × ? ⇒ 1800 + 650 = 0.49 × ? ⇒ 0.49 × ? = 2450 ∴ ? = 5000