Final answer:
a. $19.27. To find the cost of a 30-minute call with different rates for the first minute and subsequent minutes, calculate the cost of the initial minute and add the total cost of the remaining minutes.
Step-by-step explanation:
For a 30-minute call at $1.00 for the first minute and $0.63 for each additional minute, the total cost is $19.27.
The question asks about the cost of a 30-minute telephone call from Texas, U.S.A. to Ontario, Canada, with the first minute costing $1.00 and each additional minute costing $0.63. To calculate the total cost, we need to consider the cost of the first minute separately from the additional minutes. The first minute costs $1.00, and the remaining 29 minutes cost $0.63 each. Therefore:
Cost of first minute: $1.00
Cost of 29 additional minutes: 29 × $0.63 = $18.27
Total cost: $1.00 + $18.27 = $19.27
The correct answer is (a) $19.27. Hence, a 30-minute call from Texas to Ontario will cost $19.27.