7/8 of an hour is 52.5 minutes. 3/10 of 52.5 minutes is 15.75 minutes. They spent 15.75 minutes warming up and cooling down.
Lets use 1 to solve this problem because it is easiest to show.
Multiply 1 by 1.3 for a 30% increase (1*1.3=1.3).
Then multiply 1.3 by .7 for a 30% decrease. (1.3*.7=.91)
Therefore the page had a 9% reduction from its original size or is 91% of its original size.
Answer:
Step-by-step explanation:
she runs the air during the 4 hottest months.....30 days per month....so she runs the air for (30 * 4) = 120 days
she runs it for 7 hrs per day....so she runs it (7 * 120) = 840 hrs
at a cost of 0.25 per hr....(840 * 0.25) = $ 210 <==