Please answer the following question by reasoning step-by-step.
Gillian’s phone bill is usually $50 a month. If the monthly bill increases by 10%, what will be her phone bill for the entire next year?

660
Her new monthly bill will be $50 * 110 / 100 = $55.

Her phone bill for the entire year will be $55 * 12 = $660.

.

Therefore, the answer is 660