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 Calculation: 40% of (15×42+20)=? ⇒ 40%of(15×16+20)=? ⇒ 40%of(240+20)=? ⇒ 40%of260=? ∴ The value of ? will be 104.