A household already consumes exactly units of electricity per month from various…

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

A household already consumes exactly

150

units of electricity per month from various appliances. Four incandescent bulbs of

60\,\text{W}

each, used

6\,\text{h}

daily, are replaced by four LED bulbs of

10\,\text{W}

each used for the same duration. The tariff is Rs.

6

per unit for the first

150

units and Rs.

8

per unit for any units beyond that limit. The monthly saving in the electricity bill due to this replacement is closest to (a) Rs.

216

(b) Rs.

260

288

(d) Rs.

230