Sec 1 Mathematics Percentage topical questions

Convert each value as instructed.

1. (a)Express 7/25 as a percentage.[1]
2. (b)Express 0.06 as a percentage.[1]
3. (c)Express 65% as a fraction in its simplest form.[1]

Find 42% of 350.

A dress priced at $68 is sold at a 25% discount. Find the sale price.

In a class of 40 students, 55% are girls. How many boys are there?

Work out each value.

1. (a)Express 9/40 as a percentage.[1]
2. (b)Find 120% of 45.[1]
3. (c)State $3 out of the $24 total as a percentage.[1]

A kopi stall raises the price of a coffee from $1.20 to $1.35. Find the percentage increase.

A shop buys a lamp for $80 and sells it for $98.

1. (a)Find the profit in dollars.[1]
2. (b)Express the profit as a percentage of the cost price.[2]
3. (c)State whether the profit is 22.5% of the selling price. Justify briefly.[1]

The number of visitors to a park rose from 2 400 in January to 3 060 in February.

1. (a)Find the increase in visitors.[1]
2. (b)Express the increase as a percentage of the January figure.[2]
3. (c)In March the park expects the February figure to decrease by 10%. Estimate the March attendance.[1]

A laptop is sold at $840 after a discount of 16% on its marked price.

A bubble tea shop gives members 15% off the usual price. Priya’s member price for a large drink is $5.10.

1. (a)Find the usual price of the drink.[2]
2. (b)Priya pays with a $10 note. How much change does she receive?[2]

A restaurant bill comes to $86 before charges. GST is 9%, and the stall adds a 10% service charge, both computed on the $86.

1. (a)Find the GST on $86.[1]
2. (b)Find the total bill with GST only.[1]
3. (c)Find the total bill with both the service charge and GST.[2]

A hawker stall’s revenue rises by 20% in June, then falls by 20% in July, ending at $3 456.

1. (a)Find the May revenue.[3]
2. (b)Explain in one sentence why the revenue did not return to its May value.[1]

Mr Tan pays 7.5% of his monthly salary into a savings plan and spends $3 480, which is 87% of his salary, keeping the rest as cash.

1. (a)Find his monthly salary.[2]
2. (b)Find the amount he keeps as cash.[2]

A bank pays simple interest of 2% per year. Deva invests $P and removes the total amount after 4 years, which is $2 160.

1. (a)Write an expression for the amount after 4 years in terms of P.[2]
2. (b)Find P.[2]
3. (c)State the total interest earned.[1]

A shopkeeper marks a bag at $180. During a sale he gives a 25% discount and still makes a profit of 20% on his cost price.

1. (a)Find the sale price of the bag.[1]
2. (b)Explain why the cost price satisfies Cost × 1.2 = sale price.[2]
3. (c)Find the cost price.[2]