The price of gasoline at a service station increased from PS13159

GMAT PS13159

The price of gasoline at a service station increased from $1.65 per gallon last week to $1.82 per gallon this week. Sally paid $26.40 for gasoline last week at the station. How much more will Sally pay this week at the station for the same amount of gasoline?

A. $1.70
B. $2.55
C. $2.64
D. $2.72
E. $2.90

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[jabhatta]

Hi Avi - at @1.54 - you mention when it comes to (e) - you are adding 10 % on top of 10 %.

Does that mean, you would be adding - 11 % or 20 %, when it comes to (E) specifically.

[jabhatta]

Hi @Quant Reasoning

Avi – for the first method (estimation), how come % increase was used and not change factor ?
I went with change factor

If I remember, the % increase is NOT ALWAYS reliable. I don’t recall the exact reason why.

Any reason why % increase and NOT change factor method was used?

However, the change factor methodology was EXTREMELY CALCULATIVE intensive.