The plans of a building are drawn to a scale of 1 : 150. (a) Find the actual length, in metres, represented by 42 cm on the plan. [1]
(b) The actual length of the diagonal of a hall is 33 m. Find its length, in cm, on the plane
Kindly send the calculations too

The john nash mall used 17,4000 kilowatt hours in may, with a peak load of 92 kilowatts. the demand charge is $5.95 per kilowatt, and the energy charge is $0.08 per kilowatt hour. the fuel adjustment charge is $0.017 per kilowatt hour. what is the total electricity cost for may?