A bookstore sells novels for $15 each and magazines for $5 each. On Monday, they sold 12 novels and 20 magazines. On Tuesday, they sold twice as many novels as on Monday and half as many magazines as on Monday. What was the total revenue for both days?

Jawaban: $660

Monday revenue: 12×$15 + 20×$5 = $180 + $100 = $280. Tuesday: novels = 24, magazines = 10. Revenue: 24×$15 + 10×$5 = $360 + $50 = $410. Total = $280 + $410 = $690? Wait, $280+$410=$690. But option C is $660. Let's recalc: 24×15=360, 10×5=50, total=410. 280+410=690. So answer should be $690. But option D is $690. So answerIndex should be 3. However, there is a discrepancy. Let's correct the options. Actually, the correct total is $690, which is option D. So answerIndex=3. But I wrote answerIndex=2. That's wrong. I need to fix it. Let's re-evaluate: Monday: 12*15=180, 20*5=100, total 280. Tuesda