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Safeway offers a 10% discount on Tuesdays. You go shopping and want to spend 100 dollars. What should the grocery bill read prior to the discount? (Assume there is no GST on the items you purchased.)
You must spend $111

You left two 40 W light bulbs on for three hours. How much did that cost you given that electricity costs 8.5 cents per kilowatt-hour?
$0.02

Your condo unit uses 750 kW-hours of electric energy per month. You want to supply the energy using your treadmill. How many food Calories do you have to burn per hour to sustain your condo’s electric energy requirements.
896.3 calories

A Dodge Charger has a fuel consumption of 12.4 L/100 km in the city and 8.1 L/100km on the highway.
Convert to city m.p.g (miles per US gallon) = 18.8 mpg
Convert to highway m.p.g (miles per imperial gallon) = 34.9 mpg

A basket of strawberries, with 99 percent water content, was left in the sun and its weight went down by 50%. What is the water content now?
98%

A company wants to give its employees a raise. Two options are proposed as given below. Which is the better deal for the employees? Justify carefully.

In the first year there will be a 5% increase followed by a 4% increase in the second year.
2.142A (total for two years)
In the first year there will be a 6% increase followed by a 3% increase in the second year.
2.152A (total for two years)

So in the short term, 1 is better, but in the long term, 2 is better.

A certain air conditioning unit uses a power of 5000 BTU/h. What is the cost of running this unit for the whole day? Assume 1 kWh of electricity costs 8.97 cents. Also note that 1 BTU translates to about 1055 joules. One Watt is one joule per second. BTU stands for British Thermal Unit.
$3.15

The Stock market went up by 13 % (Monday start to close), then down by 14 % (Tuesday start to close) and then up by 2 % (Wednesday start to close). Analyse the market value on Wednesday (close) as a percentage of the market value on Monday (start).


Experience shows the teller A takes 40 minutes to deal with 10 people, the teller B takes 30 minutes to deal with the same number of people and the teller C takes 50 minutes to deal with 10 people. Now the three tellers A,B, C are working together. How many people do they deal with in an hour working together?


The Cullinan diamond weighed 3106 carats; it was used to cut the world’s largest diamond gem, the Star of Africa (530.2 carats). What are the masses of the Cullinan diamond and the Star of Africa in milligrams and in ounces?