Mathematician Uncle Wang built an ecological orchard. Due to the shortage of funds, he borrowed 200,000 yuan from the bank to repay the loan in three years. The repayment interest is 6.45%. Three years later. Solution: Suppose that X million yuan will be paid to the bank after 3 years.

20*( 1+6.45%)^3=x

X = 2465438+250,000 yuan

Precautions:

The principal is 200,000 yuan, and the interest rate is 6.45%.

The repayment in the first year is 20 *( 1+6.45%) yuan.

The principal and interest of the first year are used as the principal of the second year, and the second year needs to be repaid by 20 * (1+6.45%) * (1+6.45%).

The same is true in the third year.