exam Maths Puzzle Numerical Ability

A retailer has some vidio games that cost her #25 each. She wants to sel them at a profit od 80% of the cost. What price should she charge fo rthe video games?

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exam Other Question

if n = 105 (# of houses)
sample mean price of house is = x = 221,000.00
z = 1.96 for confidence interval of 95%

how do i calculate the confidence levels?
Write an equation of the line containing the given point and parallel to the given line.
(8,-2); 6x-7y=2
The equation of the line is y=__________