So Master Zhao used 1-20%-22%=58%.

2. The first day1200 * (5/8-10%) =1200 * 0.525 = 630m for repair.

3. A granary was built to store X tons of grain.

The final grain storage is (1+15%) x =1.15x.

x-2/5x+ 176 = 1. 15x。

0.55x= 176

x=320

So the granary originally stored 320 tons of grain.

Suppose there are X-Men in this workshop.

Then there are 0.9x female employees, 1.2x female employees.

0.9x+ 15= 1.2x

0.3x= 15

x=50

So there are 50 people in this workshop.