In 2007, the first iphone was priced at $599. today the iphone 11 is priced at $999 . what is the percent change in the cost.

40%

Step-by-step explanation:

599/999 is about equivalent to 60%

100 minus 60 is forty

answer:

c 60% on edg

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.