Help plz. full working out

£ 186.20

Step-by-step explanation:

height = 6 cm = 0.06 m

Volume of gravel drive away = length * width * height

            = 11 * 4 * 0.06

           = 2.64 m³

Number of gravel bags needed = 2.64 ÷ 0.4

                                                      = 6.6

7 bags are to be purchased by him.

Cost of a bag = £ 38

Cost of 7 bags = 38 * 7 = £ 266

Discount = 30% of 266

                    = £ 79.80

Amount paid by Martin = 266 - 79.80

                                      = £ 186.20

Wha i didn't understand