Day 3 is A because it tell how many pieces of candies eaten in a minute.
Day 4 is 10 and 15 because the ratios go in a pattern by 5
Day 5 is D but I really dont know that one
Answer:
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It is a 5% discount 400 x .05 = 20
400 - 20 = 380
64
x+81+x+39+50+62=360
2x+232=360
2x=128
x=64