exam Maths Puzzle Numerical Ability

Can you please help me solve: If the sales tax on a $60 purchase is $3.90, What would it be on a $280 purchase?

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exam Other Question

a rectangular plot has been fenced with 300 meters of long wire . find the length and breadth of the plot,if the length is twice its width. Also find the perimeter for each line discrbed find an equation of the line in slope intercept form and in standard form.

through (4,-2)and perpendiculap to the line (3,7) and (5,6)