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Sagot :
Using proportions, it is found that the total cost of three bottles of detergent is of $11.55.
What is a proportion?
A proportion is a fraction of a total amount.
A certain brand of laundry detergent is manufactured for $4.40 and then marked up 25% by the local store before selling, hence the price of each bottle is given by:
P = 4.40 x 1.25 = $5.50.
The store offers a 30% discount with the purchase of three or more bottles of the detergent, hence the total cost is given by:
T = (3 x 5.50) x 0.7 = $11.55.
More can be learned about proportions at https://brainly.com/question/24372153
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