Mr Chan bought a car at $16000 and then sold it to Mr Wong at $20000. What is the profit percentage?
陳先生以$16000買入一部汽車,然後他以$20000賣給黃先生,問賺率為多少?
If Mr Wong's monthly salary is increased by 25%, it will become $12600. What is his original monthly salary?
如果黃先生的月薪增加25%,它將成為$12600。問他原本的月薪是多少?