Let the cost of 8 quintals of soyabean be Rs x. The quantity of soyabeans and their cost are in direct proportion.
\(\therefore \frac{12}{36000} = \frac{8}{x}\)
∴ 12x = 8 × 36000 ….(Multiplying both sides by 36000x)
\(\therefore x = \frac{8 \times 36000}{12} = 24000\)
∴ The cost of 8 quintals of soyabean is Rs 24000.
