exam Maths Puzzle Numerical Ability

A girl is selling homemade cookies for $.75 a piece. She spent $3 on posters to advertise her cookies. How many cookies must she sell so that her profit is at least $25?

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I am having major trouble with logarithms, please help??

simplify: log >3 81 (the three is on the bottom of the log)

simplify: log a^1/2 b^2 / c^3

simplify: log x = 3
the picture is a rectangle with an X going through it.the top left corner M the top right corner R. the bottom left corner O the bottom right corner P
and the given is MP congrue