There were 15 males and 10 more girls at the party. Each attendee received 2 cans of soft drinks. If Mary bought several boxes of soft drinks where a box contains 8 cans and is priced at $5 for each box, how much did Mary spend on soft drinks? Think carefully first, then make a decision:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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There were 10 + 15 = 25 girls in the party. So, there were a total of 15 + 25 = 40 attendees. 40 x 2 = 80 cans of soft drinks are needed. So, Mary bought 80 / 8 = 10 boxes of soft drinks. Therefore, Mary spent 10 x $5 = $50 on soft drinks. So, the answer is 50.