In a pharma company, a scientist is mixing the purified form of Acetone and Toluene to invent some medicine. The cost of the solution obtained after mixing Acetone and Toluene is Rs.16 per litre. Acetone costs Rs.14 per litre to the scientist. Due to storage issue, Toluene’s cost is expensive than Acetone to the scientist. The ratio of Toluene to Acetone in the solution is 4 : 1. What is the cost of Toluene per litre (in ₹) to the scientist?