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Please help me to solve this problem. A company invests a total of $30,000 or surplus funds at two annual rates of interest : 5% and 6.75%. It wishes an annual yield of no less than 6.5%. What is the least amount of money that the company must invest at the 6.75% rate?
let x=$ invested at 6.75% rate
$30000-x=$invested at 5% rate
The least amount of money that the company must invest at the 6.75% rate=$25714.28