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nlexa [21]
2 years ago
13

bricks cost £120 quantity 1000, plasterboard cost £ 60 quantity 10, bolts cost £8 quantity 10. He orders 100000 bricks,10 plaste

rboard and 1000 bolts. what is the total cost of the order?
Mathematics
1 answer:
scoundrel [369]2 years ago
7 0

Assuming:

Assuming you mean sets, as in "1 brick" meaning £120 worth of bricks.

--------------------------------------------------------------------------------------------------------------

Summarizing:

£12,000 for bricks.


£600 for plasterboard.


£8,000 for bolts.


--------------------------------------------------------------------------------------------------------------

Total:

£20,600

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Answer:

The expression for her balance is "B(t) = -75*t + 1500". It'll take her 20 months to pay off the loan.

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We are looking for a function that has the following points:

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Between B(4) and B(7), there was a variation of 3 months and a variation of -225 on her balance, thefore for each month that passed there was a variation of -75. Thefore, the expression for her ballance is:

B(t) = -75*t + 1500

To check if this expression is valid, we will apply the values provided on the problem:

B(0) = -75*0 + 1500 = 1500 (valid)

B(4) = -75*4 + 1500 = -300 + 1500 = 1200 (valid)

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When she pays of her loan, B(t) = 0, so we need to solve for t as shown below:

B(t) = -75*t + 1500 = 0

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