Mathematical bank deposit problem

1。 10000 x 2.25% x( 1-20%)= 180

2。 As mentioned above, the actual interest earned after 5000 deposit for one year is 5000x2.25%x( 1-20%)=90.

Plus the principal, so the principal and interest are 5090.

3.。 After one year of deposit, the account has10000x2.25% x (1-20%)+10000 =10180.

If it is kept for another year, it will be10180x2.25% x (1-20%)+10180 =10363.24.

4. Answer: The first year10000x80% x 2.25% =180.

Second year10180x2.25% x (1-20%) =183.24.

The third year is10363.24x80% x 2.25% =186.54.

* * * Interest:180+183.24+186.54 = 549.78.

B: 10000x2.70%x3x80%=648。

648-549.78=98.22

So B has more interests, 98.22 more than A..