3 years ago

I need help with these questions.

Mathematics

1 answer:

RSB [31]3 years ago

8 0

Answer:

Question 1

Given

SP = 144
P = 20%
CP = x

Use formula and solve for x:

SP = CP + P
144 = x + (20% of x)
144 = x + 0.2x
144 = 1.2x
x = 144/1.2
x = 120

Cost price is N 120

Question 2

Given

SP = 1000
P = -20% (negative because of loss)
CP = x

Use formula and solve for x:

SP = CP + P
10000 = x - (20% of x)
10000 = x - 0.2x
10000 = 0.8x
x = 10000/0.8
x = 12500

Cost is N 12500

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The closest answer that makes any sense is 64.9. Often these problems are worked by someone who uses inappropriate rounding of intermediate results. I haven't found the magic set of numbers to get 64.9. About the lowest I can get is 66.7, using 0.0037·e^(0.7x).

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