exam Maths Puzzle Numerical Ability

A total of $9000 is invested, part at 4% and part at 5%. How much did he invest at each rate if his income was $380?

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A company has purchased a delivery van for $16,000. In five years, when they trade in this van, they will receive $1,500 credit toward the purchase of the next model. If they rec why are the two types of circular permutations different?in case of beads (n-1)! is used and in case of beads (n-1)!/2 is used. why?? in case of flowers which one of them will be used??