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Answer:
a.
500x+0.04=y
400x+0.05=y
for percentages move decimal to the left twice
21.27*40= Annual premium is 850.8 51% of 850.8 is 433.9 ---> semi annual his quarterly is 26% of 850.8 so 221.2 and finally his monthly premium is 9 percent of 850.8 so it's 76.57
3/4 = 45/60, 4/5 = 48/60, 2/3 = 40/ 60
