exam Maths Puzzle Numerical Ability

A saleswoman at a car dealership earns $1200 per month plus a 9% commission on her total sales. If she earned $7320 last month, what was the amount of her sales?

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what is the y-intercept of the paralola y=x^2+10x+30 Find the equation, in standard form, with all integer coefficients, of the line perpendicular to x + 3y =12 and passing through (9,-5).