Percentage Basics
Convert 12% to a decimal.
0.12
What is the GST rate in New Zealand?
15%
Simplify the ratio 10:15.
2:3
What is the formula for simple interest?
I= Prt
What is the compound interest formula?
A = P(1 + r/100)ⁿ
Convert 2.5% to a decimal.
0.025
An item costs $100 before GST. What is the GST-inclusive price?
115
Share $60 between two people in the ratio 1:2.
20:40
Find the interest earned on $500 invested at 4% p.a. for 1 year.
20
$500 is invested at 2% p.a., compounded yearly, for 1 year. Find the total amount.
510
What is 20% of 50?
10
A jacket costs $115, GST-inclusive. What was the price before GST?
100
A recipe uses flour and sugar in the ratio 3:1. If you use 450g of flour, how much sugar do you need?
150
$800 is invested at 5% p.a. simple interest for 3 years. Find the total interest earned.
120
$1000 is invested at 5% p.a., compounded yearly, for 2 years. Find the total amount.
1102.50
15 out of 20 students passed a test. What percentage passed?
75%
A laptop costs $1,200 excluding GST. What is the GST amount？
180
6 apples cost $3. How much would 15 apples cost?
7.5
You borrow $200 at 10% simple interest per week. How much do you owe in total after 3 weeks?
260
$2000 is invested at 4% p.a., compounded yearly, for 3 years. Find the interest earned.
249.73
A jacket originally costs $85. It is on sale with a 20% discount. What is the final price after the discount?
68
A laptop costs $1,200 excluding GST. What is the total price?
1380
Three friends split a $180 Airbnb cost in the ratio 2:3:4. How much does each person pay?
40:60:80
$1000 is invested at 3.5% p.a. simple interest. After how many years will the interest earned reach $350?
10
$5000 is invested at 2.4% p.a., compounded monthly, for 1 year. Find the total amount. (Hint: watch the rate and n!)
5121.34