book Maths Puzzle Numerical Ability

simple interest= amount of deposit x interest rate (decimal) x time (years)

deposit $250
5.5 interest
0.5 year

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book Other Question

Find the equation of the line which passes through the point(-4,2) and is parallel to the verticle line x=5.

The parallel and verticle line x=5 is really thowing me off.
A business class divided an imaginary investment of $80,000 among 3 mutual funds. The first fund grew by 10%, the second grew by 6% and the third grew by 15%. The total earnings