Express 250 meters as a percentage of 2 kilometers.

Express 4 kilograms as a percentage of 500 grams.

Bob was preparing for his grandpa's birthday party. He bought some food with 30% of his money. He bought some drinks with 40% of the remaining money and had $42 left. How much did Bob have at first?

15% of the people who attended a workshop wore glasses. If 30 people wore glasses, find the total number of people who attended the workshop.

35% of the workforce in Company A is in the engineering department.

Given that 105 people work in the engineering department, find the number of people in the workforce.

The usual price of a toy was $64. A shop sold the toy to customers at $72. Find the percentage increase in price.

The usual price of a book was $20. Miko sold the book to Elsa for $23.60.

Find the percentage increase in price.

When Miko was 10 years old, she was 135 cm tall. Two years later, her height had increased by 20%. Find Miko's height when she was 12 years old.

When Sally was 10 years old, she was 140 cm tall.

Two years later, her height had increased by 10%.

Find Sally's height when she was 12 years old.

The usual price of a tablet device was $1470.

At an IT fair, Charisse bought the tablet device at a discount of 10%.How much did she pay for the tablet device?