math
posted by donna .
George saves 18% of his total gross weekly earnings from his 2 parttime jobs. He earns $6.25 per hour from one parttime job and $7.50 per hour from the other parttime job. George works a total of 40 hours between the two jobs each week. What additional information is needed to determine the amount of his earnings he saves each week?

How many hours he spends on each job is needed.