Answer:
basic = 80g
designer = 120g
Explanation:
simultaneous equations:
2B + 2D = 400g
4B + D = 440g -> D = 440 - 4B
to work out B:
2B + 2(440 - 4B) = 440
2B + 880 - 8B = 440 # divide whole thing by 2 to make it simpler
B + 440 - 4B = 220
-3B = -240 # divide both sides by -1
3B = 240
B = 80
to work out D: (substitute B)
4(80) + D = 440g
320 + D = 440g
D = 120
