Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_74 (win__percentage INTEGER, year VARCHAR, crew VARCHAR)

### Question ###
What is the total of win percentages when the year is 2008 and the crew is varsity 8+?

### Accurate SQL ###

SELECT SUM(win__percentage) FROM table_name_74 WHERE year = "2008" AND crew = "varsity 8+"