exam Maths Puzzle Numerical Ability

an appliance dealer bought some television sets for $180 and resold them for $225. What percent of the original cost was his profit?

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exam Other Question

Factor the polynomial by grouping the first two terms and the last two terms:

x^3 - 4x^2 + 2x - 8
Another question:
Find the zero of the following function
f(x)=6x+3

Thank you,
Jass