Question

If each edge of a cube is increased by40% then the percentage increase in its surface area is

Answer 1

Step-by-step explanation:

surface area =6asquare

a be edge

suppose here ^represents square

new edge =a+a×40÷100=7a÷5

new surface area = 6 × (7a÷5)^=294÷25a^=11.76a^

increase in surface area = 11.76a^- 6a^=5.76a^

percentage increase in surface area = 5.76a^÷6a^×100=96%