Rahul went to a shop and bought things worth Rs. 50, out of which 80 Paise went on sales tax on taxable purchases. If the tax rate was 8%, then what was the cost of the tax free items?	Select:
A) 21.4	B) 12.4	C) 41.2	D) 39.2	E) 32.9
Total cost of the items he purchased = Rs.50   Given that out of this Rs.50, 80 Paise is given as tax   =&gt; Total tax incurred = 80 Paise = Rs.80/100   Let the cost of the tax free items = x   Given that tax rate = 8%   ∴ (50−80/100−x)8/100 = 80/100   ⇒ 8(50 −0.8 −x) = 80   ⇒ (50 − 0.8 − x) = 10   ⇒ x = 50 − 0.8−10 = 39.2   39.2)
<result>D</result>
Rahul went to a shop and bought things worth Rs. 50, out of which 80 Paise went on sales tax on taxable purchases. If the tax rate was 8%, then what was the cost of the tax free items?