book Maths Puzzle Numerical Ability

please help
How many arrangements of the letters in the word OLIVE can you make if each arrangement must use three letters?
please explain the answer
A)20
b)60
c)8*7*6*5*4*3*2*1

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book Other Question
A company collects 70% of its sales during the month of the sale, 20% one month after the sale, and 10% two months after the ssle. The company excpects sales of $10,000 in June, 2 my questions is
solve m+9.35=2.73

my answer is m=-6.62
thanks for the help