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  3. for a given interest rate, simple interest varies

For a given interest rate, simple interest varies jointly as the principal and time. If...

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For a given interest rate, simple interest varies jointly as the principal and time. If $1000 left in an account for 6 years earned interest of $420, then how much interest would be earned in 7 years? The amount of interest earned in 7 years would be $ (Type an integer or a decimal.)

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