Option 4: 139.29 -> The Consumer Price Index (CPI) is calculated as: CPI = (Cost of basket in current year / Cost of basket in base year) × 100. Base year (2000) cost = (90 kg × Rs 10) + (5 pairs × Rs 100) = Rs 900 + Rs 500 = Rs 1400. Current year (2005) cost = (90 kg × Rs 15) + (5 pairs × Rs 120) = Rs 1350 + Rs 600 = Rs 1950. Therefore, CPI = (1950/1400) × 100 = 139.29. This indicates that prices have increased by approximately 39.29% from 2000 to 2005. -> correct