A manager uses the SLR model to study the relationship between training hours (X) and a job efficiency index (Y). From a sample of 40 employees, she finds: b0 = 13, b1 = 2, SSR = 94.7, and SSE = 38.6 What percentage of variation in job efficiency index values is accounted for by the assumed relationship with training hours? (Round to the nearest percent and do not include the % sign in your answer.)