ISEE Middle Level Quantitative Reasoning · Question of the Day

ISEE Middle Level Quantitative Reasoning Question of the Day

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Friday, August 14, 2026

A monthly phone bill, $B$ , is calculated using the function $B(d) = 25 + 0.05(d - 500)$ for data usage, $d$ , greater than 500 megabytes. If data usage is 500 MB or less, the bill is a flat $25.

What is the total bill for a month where 860 MB of data were used?

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Question of the Day

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A monthly phone bill, $B$ , is calculated using the function $B(d) = 25 + 0.05(d - 500)$ for data usage, $d$ , greater than 500 megabytes. If data usage is 500 MB or less, the bill is a flat $25.

What is the total bill for a month where 860 MB of data were used?

$18.00
$43.00 (correct answer)
$68.00
$80.00

Explanation: The correct answer is $43.00. Since 860 MB is greater than 500 MB, the function $B(d) = 25 + 0.05(d - 500)$ applies. First, find the amount of data over 500 MB: $860 - 500 = 360$ MB. Next, calculate the cost for this extra data: $0.05 \times 360 = 18$ . Finally, add this to the base cost of $25: $25 + 18 = 43$ . The total bill is $43.00.