Add only the cells in one column when the value in another column is specific

If I have a column labeled Description (say Column B) and another labeled Expenses (Column E) in which the cost of the expense is contained, is there a way to tally only those numbers in Column E when the entry in Column B is something very specific, such as "brooms"?

E.G.:

Date Description Cost
1/1/15 dust pans 15.00
2/1/15 mops 45.00
3/1/15 mops 45.00
4/1/15 dust pans 15.00

In another field I want to total the cost of mops only, which would show the total cost to be $90. Is there a way to do that or must the table be laid out by individual types of expenses in their own column or row?

=sumif(b1:b100,"brooms",e1:e100)

Wow. Worked perfectly! (After changing the text, of course.) I'll never be able to remember that and can't imagine how anyone would come to know it. I really didn't expect that question to have an answer that suited what I wanted to do perfectly. Thanks b1*b2 when b2 =or> 1000!

Wow. Worked perfectly! (After changing the text, of course.) I'll never be able to remember that and can't imagine how anyone would come to know it. I really didn't expect that question to have an answer that suited what I wanted to do perfectly. Thanks b1*b2 times when b2 =or> 1000!