Answer: Taxable value = ₹ 1500, CGST = ₹ 135, SGST = ₹ 135
Let the taxable value be ₹ \(x\). Then total value \( = x + 18\% \text{ of } x = 1.18x \).
\[ 1.18x = 1770 \Rightarrow x = \frac{1770}{1.18} = 1500 \]
GST \( = 1770 - 1500 = ₹\,270 \).
CGST = SGST \( = 270 \div 2 = ₹\,135 \) (each at 9%).