Salim buys an article for Rs 784 which includes GST of 12 per cent. What is the price before GST?

1. The paid price already contains the tax, so Rs 784 is 112 per cent of the base price. 2. Base price = 784 x (100/112). 3. 784 / 112 = 7, so base price = 7 x 100 = Rs 700. 4. Check: 12 per cent of 700 = 84, and 700 + 84 = 784. 5. Deducting 12 per cent of 784 gives Rs 690, the trap answer. _Source: NCERT Class 8 Maths Ch7 'Comparing Quantities', Example 6_