a) ₹ 320

b) ₹ 340

c) ₹ 360

d) ₹ 380

correct answer is: c) ₹ 360

**Explanation**

To find the cost of 0.15 part of a bag of rice, we can use *‘Proportion Method’*.

Let, the cost of 0.15 part of a bag of rice =\;₹\;‘x’

According to the question,

\large\frac{0.15}{0.75}=\frac{x}{1800}

\rightarrow\large\frac{15\times100}{75\times100}=\frac{x}{1800} _{[remove decimal]}

\rightarrow\large\frac{1}{5}=\frac{x}{1800}

\rightarrow5x=1800 _{[interchange]}

\rightarrow\ x=\large\frac{1800}{5}

\rightarrow\ x=360

\therefore The cost of 0.15 part of a bag of rice is ₹\;360 .**Ans:** If the cost of 0.75 part of a bag of rice is ₹ 1800, then the cost of 0.15 part of it is ₹ 360.

**There’s another way to pose this same question:****1. Determine the cost of purchasing 0.15 part of a bag of rice when the cost of 0.75 part is ₹1800.****2. Calculate the cost of 0.15 part of a bag of rice if the cost of 0.75 part is ₹1800.****3. Find out the price of 0.15 part of a bag of rice given that the cost of 0.75 part is ₹1800.****4. What is the cost of 0.15 part of a bag of rice if the cost of 0.75 part is ₹1800?**