Question

what is the cast price of the
mobile phone call that lasts for 3 minute
at the rate of 50% per 30 seconds?​

Answer 1

Answer:

10 rs cost for 3 minutes 30 second

1minute= 60 seconds

3× 60= 180 seconds

Now we can write in seconds

10 rs cost for 210 seconds (180+30)

(210÷10)=21 which mean 1rs cost 21 seconds

For 4 minutes 10 seconds

4×60 =240 seconds

240+10=250 seconds

(250÷21)= 11.90 rs

The cost of bill is 11.90 rs for 4 minutes 10 seconds