Mohan went to a shop and bought things worth Rs. 100, out of which 90 Paise went on sales tax on taxable purchases. If the tax rate was 9%, then what was the cost of the tax free items?	Pick:
A) 89.1 B) 88.1 C) 79.1 D) 80.1 E) 85.1
Total cost of the items he purchased = Rs.100   Given that out of this Rs.100, 90 Paise is given as tax   =&gt; Total tax incurred = 90 Paise = Rs.90/100   Let the cost of the tax free items = x   Given that tax rate = 6%   ∴ (100−90/100−x)9/100 = 90/100   ⇒ 9(100−0.9−x) = 90   ⇒ (100 − 0.9 − x) = 10   ⇒ x = 100 − 0.9 − 10 = 89.1   89.1)
<result>A</result>
Mohan went to a shop and bought things worth Rs. 100, out of which 90 Paise went on sales tax on taxable purchases. If the tax rate was 9%, then what was the cost of the tax free items?