Chapter 1, Problem 1.61E

A Toyota Prius Hybrid uses 59.7 L gasoline to drive from San Francisco to Seattle, a distance of 1300 km (two significant digits). (a) What (average) fuel economy, in miles per gallon, did the Prius get during this trip? (b) If gasoline costs $3.90 per gallon, what was the fuel cost for this trip? REGARDING PART B!! So, the answer listed for part b is $62. Why is it 2 significant figures? Shouldn't it be $61.6 since 59.7 L is 3 significant figures?   Here is my calculation:   (59.7 L) x (1.0567 qt/1L) x (1 gal/ 4 qt) = 15.8 gallons x $3.90 = $61.6   I see for part A why it is 2 significant figures, since 1300 km is 2 significant figures, but shouldn't part b be 3 significant figures since the kilometers is not involved?   Thank you!

You are in Paris, and you want to buy some peaches for lunch. The sign in the fruit stand indicates that peaches cost 4.00 euros per kilogram. Given that 1 euro is equivalent to approximately $1.20, calculate what a pound of peaches will cost in dollars.

If 20.0 Cal make an ounce, how many ounces of formula should a baby drink per day if the energy needed per day is 1.50 x 10E3 Cal? Express answer to the correct number of significant figures.