book Maths Puzzle Numerical Ability

In the real world, where might these so-called imaginary numbers be used?

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If four years of college is expected to coast $135000 10 years from now, how much must be deposited now into an account that will average %4 annually in order to save the $135000? An employee of the computer store is paid a base salary of $1,175 per month plus a 5% commission on all sales during the month. How much must this employee sell in one month to earn a total of 3,170 for the month