Question

Kieran subscribes to a text messaging service on his cell phone. His monthly bill for the service is given by the equation b = 0.27t, where b is the bill amount and t is the number of texts. The constant of proportionality in terms of cost per text is ___.

Answer 1

0.27

Explanation:

b = bill amount

t = number of texts

b and t are proportionally related as ;

Bill amount α number of texts

b α t

b = kt

Where, k = constant of proportionality

Comparing b = kt with the equation given :

b = kt

b = 0.27t

Hence, k = 0.27

Constant of proportionality = 0.27