~asap offering 25 points will mark brainiest too~ question #1 don's fishing sells fishing lures for $1.88 after marking them up 380% based on cost. what is the cost of each lure to the nearest cent to don's fishing? question #2 a can of tennis balls has a 75% markup rate based on cost. mel's sporting goods sells a can of tennis balls for $3.49. what is the markup to the nearest cent? question #3 a can of tennis balls has a 75% markup rate based on cost. mel's sporting goods sells a can of tennis balls for $3.49. what is the markup to the nearest cent? a) $1.99 b) $2.00 c)$1.85 d)$1.84 question #5 a pair of earrings has a 130% markup rate based on cost. the selling price is $77.77. what is the markup to the nearest cent? (hint: find cost first.)

1. cost + 380%×cost = 4.80×cost = $1.88

... cost = $1.88/4.80 = $0.39

2. The relation between markup, cost, and selling price lets you find the cost, hence the markup.

... cost + markup = selling price

... cost + 0.75×cost = (1+0.75)×cost = 1.75×cost = $3.49

... cost = $3.49/1.75

... markup = 0.75×cost = 0.75×($3.49/1.75) = $3.49×(0.75/1.75) = $1.50

3. Same wording as 2. None of the given answers is correct.

... cost is $1.99; markup is 75%×$1.99 = $1.50; selling price = $1.99 + 1.50 = $3.49

(Have your teacher show you how to work this.)

5. Same as 2 and 3, but with different numbers.

... markup = (130%/230%)×(selling price) = (13/23)×$77.77 = $43.96

(Check: cost is 43.96/1.3 = 33.81; cost + markup = 33.81 + 43.96 = 77.77)

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

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step-by-step explanation: