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Interest in mathematics in the sixth grade of primary school
1. Lele: 500× (1+3.06% )× (1+3.06% )× (1+3.06%) = 547.32 yuan.

Nannan: 500× (1+4.41%) = 522.05 yuan.

∫547.32 >522.05

∴547.32-522.05=25.27 yuan

A: After three years, the sum of Lele's principal and interest is more than 25.27 yuan.

2. Pre-tax interest after interest deduction:126.54÷ (1-5%) =133.2 (yuan).

Principal:133.2 ÷ 3.33% = 4,000 yuan.

Xiao Li deposited 4000 yuan in the bank.