0.2x=4.8 4.4x= 132 3x=5.4

x=24 x=30 x= 1.8

Solution 2.5x -90%=8

2.5x=8.9

x=3.56

2. Solution: Interest = principal × interest rate × time ×( 1- interest tax)-= 5000 × 2.7% × 3 × (1-20%) = 324 yuan.

3. Solution: We assume that x element (/kloc-0 /× 2.25% x )× (1-20%) = 54x =