中一升中二maths問題{20點}

1)Mr.Chan deposits $20000 into Bank A at a rete of of5% and $30000into bank B at a rate of 6%. Two banks are in system of simplee interest. How much will he have 3 years later?
The amount he will have
=(20000x5%x3+20000)+(30000x6%x3+30000)
=$58400
2)If two internal angles of a triangle is 58º and 47º, what is the remaining angle?
∠ sum of ∆=180º
∴The remaining angle
=180º-58º-47º
=75º

1.58400
2.75