Question 176674
The equation for direct-dial call is:
{{{t}}} = time in minutes for call
{{{c}}} = cost of call
{{{c = .39 + .25*(t - 1)}}}
given:
{{{t = 10}}}
An operator assisted call to another country costs $5.84
for {{{10}}} min
------------
{{{c = .39 + .25*(t - 1)}}}
{{{c = .39 + .25*(10 - 1)}}}
{{{c = .39 + 2.5 - .25}}}
{{{c = .39 + 2.25}}}
{{{c = 2.64}}}
{{{5.84 - 2.64 = 3.20}}}
The savings is $3.20