1. Uncle Wang bought his grandson an education savings deposit of 20,000 yuan, free of interest tax. The annual interest rate is 1.7 1% on a regular basis. Uncle Wang saved it for six years. How much interest will Uncle Wang get after six years?

Solution:

After the first year, Mr. Wang has RMB 20,000 * (1+1.7%) and the interest is 20,000 *1.7%.

At the beginning of the second year, Mr. Wang deposited RMB 20,000 * (65,438+0+65,438+0.7%) and earned interest of RMB 20,000 * (65,438+0.65,438+0.7%) * 65,438+at the end of the second year.

………………

By analogy, after the end of the sixth year, Uncle Wang's interest is 20000 * (1+1.7%) 5 *1.7% = 745 yuan.

2. Girls in Class 6 (1) account for 40% of the class, while girls in Class 6 (2) account for 62% of the class. Two classes 100 are known, and the number of girls accounts for 5 1%. How many students are there in Class Six (1)?

Solution:

There are six (1) classes with X students and six (2) classes with Y students. These themes are:

x+y = 100；

0.4x+0.62y = 5 1；

The solution is x=y=50 (people), so there are 50 people in Class 6 (1) and Class 6 (2).

3. In a sector statistical chart, the central angle of the sector representing the number of people participating in sports teams is 2 16, so the number of people participating in sports teams accounts for =(2 16/360 )%=60% of the class. If there are 27 people participating in the sports team, then the total number of students in the class is (27/60%=45)?