XYZ Company's accountant is estimating next period's total overhead costs (Y). She performed three regression analyses, the first is based on direct labor hours (DLH), the second is based on machine hours (Mhr), and the third is based on quantity produced (Q). The results were: [Y=$95,000 + $9XDLH; R-square = 0.901; TY= $120,000 + $5xMhr; R-square = 0.101: [Y=190,000+20 R-square=0.55). How much of the variations on the overhead costs is explained by the direct labor hours (DLH)