Calculate the electricity bill amount for a month of 30 days if the following devices are used as specified three bulbs of 40 watt for 6 hours,refrigerator of 320 watt for 24 hours,4 tube lights of 50 watt for 6 hours,given the rate of the electricity is rupees 2.50 per unit.

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$3 b u l b s o f 40 w a t t f o r 6 h r s R e f r i g e r a t o r o f 320 w a t t f o r 24 h r s 4 t u b e l i g h t s o f 50 w a t t f o r 6 h r s C a l c u l a t i n g e l e c t r i c a l e n e r g y c o n s u m p t i o n o f e a c h d e v i c e : 1 . 3 \times 40 \times 6 = 720 W h 2 . 320 \times 24 = 7680 W h 3 . 4 \times 50 \times 6 = 1200 W h T o t a l e n e r g y c o n s u m e d 720 + 7680 + 1200 = 9600 W h = 9.6 K W h = 9.6 u n i t s T o t a l e l e c t r i c e n e r g y f o r 30 d a y s = 30 x 9.6 = 288 u n i t s \cos t o f 1 u n i t = R s 2.50 \cos t o f 288 u n i t s = 288 \times 2.50 R s 720 .$

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