OG:

Whenvever Martin has a restaurant bill with an amount between $10 and $99,( he calculates the dollar amount of the ti as 2 times the tens digit of the amount of his bill.)

If the amount of M's most recent restaurant bill was between $10 and $99, was th tip cal

culated by M on this bill greater than 15percent of the amount of the bill?

(1) the amont of the bill was between $15 and $50

(2) the tip calculated by M was $8

括号里那句话不懂是什么意思,请大牛们指点一下谢谢!

我也不明白。请指点！！