Step 1: Let the marked price of the scooter be M. The discount on the scooter is 20%. Mark saves at least ₹8,000, so we have:
\[ 0.2M = 8000. \]
Step 2: Solving for M:
\[ M = \frac{8000}{0.2} = 40,000. \]
Conclusion: The minimum possible marked price of the scooter is ₹40,000.
An electricity utility company charges ₹7 per kWh. If a 40-watt desk light is left on for 10 hours each night for 180 days, what would be the cost of energy consumption? If the desk light is on for 2 more hours each night for the 180 days, what would be the percentage-increase in the cost of energy consumption?