Rahul went to a shop and bought things worth Rs. 25, out of which 30 Paise went on sales tax on taxable purchases. If the tax rate was 6%, then what was the cost of the tax free items?	Choose the correct choice from the following options:
A) Rs. 15
B) Rs. 12.10
C) Rs. 19.70
D) Rs. 16.80
E) None of these
Explanation :   Total cost of the items he purchased = Rs.25   Given that out of this Rs.25, 30 Paise is given as tax   =&gt; Total tax incurred = 30 Paise = Rs.30/100   Let the cost of the tax free items = x   Given that tax rate = 6%   ∴ (25 − (30/100) − x)(6/100) = 30/100   ⇒ 6(25 − 0.3 − x) = 30   ⇒ (25 − 0.3 − x) = 5   ⇒ x = 25 − 0.3 − 5 = 19.7   Answer : Option Rs. 19.70
<result>C</result>
Rahul went to a shop and bought things worth Rs. 25, out of which 30 Paise went on sales tax on taxable purchases. If the tax rate was 6%, then what was the cost of the tax free items?