exam Maths Puzzle Numerical Ability

87.Money is invested in a savings account at 12% simple interest.After one year there is $1,680 in the account.How much was originally invested?

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exam Other Question

Can someone think of a growth or decay function that we encounter in our work or in our personal lives? I need help with the following

Set K contains 30 elements, set J contains 46 elements, and 11 elements are common to both sets. Find n ( K U J).