If i got a B+ on the midterm and a B- on paper, what do i need on final to at least get a ping grade of C?

im in community college and my art history teacher doesnt grade by percentage, she only has three grades for the entire semester, a Midterm, a paper and a final. If i got a B+ on the Midterm which counts for 25%, a B- on the paper which counts for 25%, and the final is 35%. what would i need on the final to at least get a ping grade of C in the cl ? please help, would love to know before my final.... :)