IMAT 2019 Q3(MONEY FOR SEEDING THE LAWN)

Hey, could someone please explain Q3. OF IMAT 2019. I solved it and am getting the answer as C while the answer happens to be D.

Hey, the total lawn area can be calculated efficiently if one perceives the shape as a 4 x 6 rectangle with a 2 x 1 rectangle taken out.
(4 x 6) - 2 = 22m^2
The amount of seed required is 22 x 50 = 1100g or 1.1kg

So, a 1kg packet and a 100g packet are needed. £14 + £2 = £16

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