The rate of electricity in a town is Rs 3.00 per unit. Calculate the cost of running an 80-watt fan for ten hours a day for the whole month of june.

Vishva noticed in a dhaba around 50 bulbs, each of 100 W all were glowing. She calculated the cost of electricity consumed in one hour and told the dhaba owner to reduce the expenses and at the same time save electricity by using CFL bulbs instead of ordinary filament-type bulbs. What would be the cost of electric energy if 50 bulbs, each of 100 W. are used for one hour? 1 unit costs Rs 5.

An electric refrigerator rated 400 W operates 8 hours/day. What is the cost of the energy to operate if for 30 days at Rs 3.00 per kWh ?

A man rides his motorcycle at the speed of 50 km/hour. He has to spend Rs. 2 per km on petrol. If he rides it at a faster speed of 80 km/hour, the petrol cost increases to Rs. 3 per km. He has atmost Rs. 120 to spend on petrol and one hour's time. He wishes to find the maximum distance that he can travel. Express this problem as a linear programming problem.

An electric refrigerator rated 400 W and an electric bulb rated 100 W are operate 10 hours/day . What is the cost of the energy to operate them for 10 days at ₹ 8.00 per kWh?

An electric refrigerator rated 400 W and an electric bulb rated 100 W are operated 10 hours / day. What is the cost of the energy to operate them for 10 days at Rs. 8.00 per kWh ?

In a residence 4 tubelights each of 40W are operated daily for 5 hour and 3 fans each of 120 W are operated daily for 4 hour. What would be the amount of electricity bill at ₹ 5 per unit for the month of September?

A manufacturer produces nuts and bolts. It takes 1 hour of work on machine A and 3 hours on machine B to produce a package of nuts. It takes 3 hours on machine A and 1 hour on machine B to produce a package of bolts. He earns a profit of Rs. 17.50 per package on nuts and Rs. 7.00 per package on bolts. How many packages of each should be produced each day so as to maximise his profit, if he operates his machines for at the most 12 hours a day ?

A diet is to contain at least 80 units of vitamin A and 100 units of minerals. Two foods F_(1) and F_(2) are available. Food F_(1) costs Rs. Rs. 4 per unit food and F_(2) costs Rs. 6 per unit. One unit of food F_(1) contains 3 units of vitamin A and 4 units of minerals. One unit of food F_(2) contains 6 units, of vitamin A and 3 units of minerals, Formulate this as a linear programming problem. Find the minimum cost for diet theat consists of mixture of these two food and also meets the minimal nutritional requirements.