There are two slabs of income tax: 12% tax on the whole income for income up to Rs. 5 lakh, and 18% tax on the whole income for income above Rs. 5 lakh. Shyam attempted to evade tax by concealing a portion of his income to fall into the 12% tax slab. The amount hidden by Shyam is 5/9 of his original taxable income. If Shyam paid Rs. 36,000 as tax, what is the original amount of tax he should have paid if he did not hide his income?