Magazine charges Rs 300 per 10 sq cm. Half page ad size 15×24 ÷ 2. Find cost.
Step 1: Find the full page area.
(15 imes 24 = 360 ext{cm}^2)
Step 2: Find the half-page area.
(360 div 2 = 180 ext{cm}^2)
Case A (as written): Rate = Rs 300 per 10 cm²
Rate per (1 ext{cm}^2 = 300 div 10 = 30 ext{rupees})
Cost (= 180 imes 30 = 5400 ext{rupees})
Answer in this case: Rs 5,400
Case B (matches given answer): Rate = Rs 300 per 100 cm²
Rate per (1 ext{cm}^2 = 300 div 100 = 3 ext{rupees})
Cost (= 180 imes 3 = 540 ext{rupees})
Answer in this case: Rs 540