The cost of table salt (NaCl) is Rs 2 per Kg. Calculate the cost per mole.

If the cost of the 10 pens is Rs.180, calculate the cost of 2 pens

If the cost of the 20 pens is Rs.180, calculate the cost of 9 pens

If the cost of the 20 pens is Rs.180, calculate the cost of 5 pens

If the cost of the 20 pens is Rs.180, calculate the cost of 10 pens

If the cost of the 20 pens is Rs.180, calculate the cost of 15 pens

The internal measures of a cuboidal room are 12 m xx 8 m xx 4 m . Find the total cost of whitewashing all four walls of a room, if the cost of white washing is Rs 5 per m^2. What will be the cost of white washing if the ceiling of the room is also whitewashed.

An electic room heater is rated at 2 kW. Calculate the cost of using it for 2 hours daily for the month of september, if each unit costs Rs. 4.00

A container opened from the top and made up of a metal sheet, is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper end as 8 cm and 20 cm, respectively. Find the cost of made which can completely fill the container, at the rate of Rs 20 per litre. Also find the cost of metal shape used to make the container, if it costs Rs 8 per 16cm^(2) . (Take pi=3.14 )