(a) Price per $\mathrm{kg}=₹\left(\frac{160}{10}\right)=₹ 16$; Price per $\mathrm{kg}=₹\left(\frac{30}{2}\right)=₹ 15$; Price per $\mathrm{kg}=₹\left(\frac{70}{4}\right)=₹ 17.50$; Price per $\mathrm{kg}=₹\left(\frac{340}{20}\right)=₹ 17$; Price per $\mathrm{kg}=₹\left(\frac{130}{8}\right)=₹ 16.25$.
Explanation as extracted from the printed page; notation may be imperfect.