Gauri went to the stationers 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?

1. A Option A: Rs. 15
2. B Option B: Rs. 15.70
3. C Option C: Rs. 19.70
4. D Option D: Rs. 20

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