unit rates and unit prices

The price of 2 CDs is $8. Find the unit rate. => $5 or $6 or $7 or $4..

The United States letter rates per oz have been increasing by 10 cents in 10 years from 1970. The price of letter per oz in year 1980 was 40 cents. Predict the letter rates in the year 2010. => 70 cents or 80 cents or 75 cents or 72 cents..

Jack bought 4 pounds of grapes for $ 20. Find the unit price. => $ 20 or $ 15 or $ 0.5 or $ 5..

Commercial Unit of Electrical Energy - Kilowatt - hour is the commercial unit of electrical energy. We have seen that power is the rate of energy consumed or delivered. If 1 joule of energy is used per second, we say that energy is used at the rate of 1 watt...

Commercial Unit of Energy - The SI unit joule is too small to express very large quantities of energy. Hence we use a bigger unit called kilowatt hour (kWh) to express energy. 1 kWh is the amount of energy consumed by an electrical gadget in one hour at the rate..

Commercial Unit of Electrical Energy - The unit 'watt' is very small. Therefore, in actual practice we use a much larger unit called 'kilowatt'. It is equal to 1000 watts. Since electrical energy is the product of power and time, watt hour (W h) can also be considered ..

Laura scored a total of 270 points on 5 of her tests. Find her unit rate. => 56 or 53 or 55 or 54..

Sam bought 4 lb of candy for $24. Find the unit rate. => $8/lb or $6/lb or $5/lb or $7/lb..

There are 120 chairs and 30 tables in a classroom. What is the unit rate of chairs to tables? => 4 chairs per table or 6 chairs per table or 8 chairs per table or 5 chairs per table..

Power is denoted by the letter 'P'. As energy is the capacity to do work, power can also be defined as energy consumed in unit time. SI unit of power SI unit of work is joule and time is second. Therefore, SI unit of power is joule/sec. 1 joule/sec =..