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Theo đề bài, ta có số % số tiền rút về so với tiền gốc là :
100% + 5% = 105%
Số tiền gốc là :
5 250 000 : 105 x 100 = 5 000 000 ( đồng )
Đáp số : 5 000 000 đồng
Số tiền lãi là :
5 250 000 : 100 x 5 = 262 500 ( đồng )
Số tiền vốn là :
5 250 000 - 262 500 = 4 987 500 ( đồng )
Đ/s : 4 987 500 đồng
sau 1 tháng số tiền đó là
80000000 + 80000000 : 100 x 1,5 = 81200000 ( đồng )
sau 2 tháng số tiền đó là
81200000 + 81200000 : 100 x 1,5 = 82418000 ( đồng )
vậy sau 2 tháng số tiền tăng
82418000 - 80000000 = 2418000 ( đồng )
Đ/s : 2418000 đồng