Question

A cubical box with lid has a length of 30 cm. Find the cost of painting the inside as well as outside of the box at $5.50 per metre square

Answer 1

let a be the side of a cube
given a = 0.3 m

a/q total surface area = 6a^2

= 6× 0.3 × 0.3
= 0.54 m^2

cost = 0.54× 5.50
= $2.97


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