I would recommend rewording the three problems: percentage profit:4, 5 and 6. It would help to improve clarity and understanding.
Does this problem require the percentage profit on the other sales (i.e. not the initial W sales involving r% loss) in order to determine the quantity required to make the the overall r% profit target? Similar to the previous problem, Percentage Profit :3. Thanks.
Project Euler: Problem 10, Sum of Primes
Who knows the last digit of pi?
find radius of cone
Solve Linear equations
Percentage profit:5: Cumulative Interest
Percentage profit:6: Cumulative Interest
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