Tips & Tricks GIVEN: Dimension of square is increased by 10% CONCEPT: Here calculate the new area and then subtract it by original to calculate the percentage. FORMULAE USED: Area of new square = (side)2 SOLUTION: Let the side of square be a cm Area of square = (a)2 Side is increase by 10% New side = (110/100) × a = 1.1a Area of new square = 1.21a2 Area of square increases by ⇒ [(1.21a – 1a)/a] × 100 = 21% ∴ Area of square is increased by 21%