White paint costs £2.80 per litre. blue paint costs £3.50 per litre. white paint and blue paint are mixed in the ratio 3: 2. work out the cost of 18 litres of the mixture

White paint cost $2.80 per liter. Blue paint costs $3.50 per liter. White paint and blue paint are mixed in the ratio 3:2. Work out the cost of 18 liters of the mixture. 
You'll need 10.81 of white paint, and 7.21 of blue paint. 
10.21*2.80=30.24
7.21*3.50=25.20 
$55.44

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