Total Number of stones = 180
No.of stones required for each idol = 30
No.of idols made = 180 ÷ 30
Here as both of the numbers have one zero , we can keep the zero aside and do the calculation for 18 ÷ 3 , which we know is 6
So the total no.of idols made = 6
Cost of making 1 idol = ₹2000
Total cost of making 6 idols = 6 × ₹2000 = ₹12,000