John need to invest $16393.44 with the process of simple interest.
Simple interest is calculated based on a loan's principal or the initial deposit into a savings account. Simple interest doesn't compound, therefore a creditor will only charge interest on the principal sum, and a borrower will never be required to pay further interest on the interest that has already accrued.
Rate of interest = 12%principal + interest = $40000
Time = 12 years
Simple interest [tex]=\frac{p \times 12 \times 12}{100}\\=1.44p Now principal + interest = 40000\Rightarrow p+1.44p=40000\\\Rightarrow 2.44p=40000\\\Rightarrow p=\frac{40000}{2.44}\\\Rightarrow p= 16393.44[/tex]
Therefore, John need to invest $16393.44.
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