A sign writer is making a “TO LET” sign shown (image not to scale).

The sign is white letters on a blue background.

All the letters are 1.5 m tall and the width of the letters are 1 m.

The letters are to be painted in white paint so that each rectangle has a width of 20cm.

One tin of white paint will cover an area of 1.5m².

How many tins of white paint are needed?