Base-100 Conversions
Express the decimal 0.07 as both a percentage and a fraction in simplest form.
What are 7% and 7/100?
According to the "10% Mental Rule," you move the decimal point this many places to the left to find 10% of any bill.
What is one place?
True or False: Taking 20% off an item and then taking another 20% off at checkout means the item is 40% off.
What is False?
Converted into a working decimal, Utah's state base sales tax rate of 4.85% looks like this.
What is 0.0485?
A bag of chips increases in price from $2.00 to $2.50. This is the dollar amount of the change.
What is $0.50?
If a shoe store advertises a discount of 1/5 off all inventory, this is the equivalent percentage discount.
What is 20% off?
Without using a calculator, this 10% of a $45.00 restaurant tab.
What is $4.50?
A pair of shoes costs $50.00. After taking a 10% discount, this is the new sale price.
What is $45.00?
If an item costs$10.00 and sales tax 7%, this is the tax amount in cents.
What is 70 cents (or $0.70)?
This is the base formula used to calculate percent of change.
((New Price - Original Price)/Original Price)) x 100
This savings option gives you a larger discount on a $100 jacket: 0.25 off or 20% off.
What is 0.25 off?
Using you 10% benchmark, this is a 20% tip on a $58.00 haircut
What is $11.60?
A jacket originally priced at $100 is marked 20% off, and you have a coupon for an extra 10% off the sale price. This is the final amount you pay at checkout.
What is $72?
If you perform a tax calculation and your calculator shows $3.4281, this is the correct amount to charge the customer after rounding.
What is $3.43?
In the percent of change formula, you must always divide the amount of change by this specific value, never the new value.
What is the Original Price?
If an item is on sale for 25% off, this is the fraction of the original price you actually pay at the register.
What is 3/4 (or 75%)?
If your dinner bill comes to $30.00 and you leave a $6.00 tip, this is the exact percentage tip you gave your server.
On a $200 television, Option A offers 50% off. Option B offers $30% off plus an extra 20% stacked coupon. This option saves you more money. Must show work to earn points.
What is Option A?
Option A: 200 x 50% = 100 200-100=100
Option B: 200 x 30%= 60 200-60= 140
140x 20% = 28, 140 - 28 = 112
Option A saves $12
This is the single multiplier you can use to calculate a $100 item subtotal plus 6.5% sales tax in just one step.
What is 1.065 (or $100 x 1.065 = $106.50)?
A movie ticket cost $5.00 in 2000 and costs $10.00 today. This is the historical percent increase in price.
What is 100% increase?
Multiplying a subtotal by 0.08 gives an 8% tax, while multiplying by 0.8 calculates this percentage of the total.
What is 80%?
You have $50 cash. A jacket is marked $60 with a 20% discount. This is the dollar amount you pay before tax, and whether you have enough cash.
What is $48.00? and Yes, you have enough
Store A sells a $80 skateboard at 25% off with an extra 10% coupon. Store B sells it at a flat 30% off. This store has the lower price. Must show work to get the points.
What is Store A?
Store A: (80 x 75%)= 60 - (60 x 10%) = 54
Store B: 80 - (80 x 30%)= 56
A $150.00 coat is purchased in Salt Lake City with a 7.75% tax rate. This is the final total price after rounding tax to the nearest cent.
What is $161.63? (11.625 ------> 11.63)
A price dropping from $50 to $40 is a 20% decrease. Going back up from $40 to $50 is a 25% increase. This explains why the percentages are different.
What is the starting base (denominator) change from $50 to $40?