Make up a practical problem of percentage, a practical problem of unit "1" and a practical problem of normalization

one
Xiaoming has made 10 parts, and 8 of them are qualified. What's the qualified rate of the parts he made (the number of qualified parts divided by the total number of parts)?
8 divided by 10 = 0.8 = 80%
A:
two
Xiaoming made 10 toys. He made 5% of Xiaogang's toys
10 divided by 50% = 20
A:
three
Xiao Ming has made 50 parts, which takes 5 hours. If xiao gang does it at the same speed, how many parts can he make in 10 hours?
Speed: 50 divided by 5 = 10 per hour
Number: 10 * 10 = 100
A:

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