This math topic focuses on calculating percent growth of a number with visual aids, specifically involving multiples of 10% like 20% and 30%. It practices the skill of determining the total amount after applying a percentage increase, which is illustrated through real-world scenarios like calculating the total bill including a tip. Each problem posits a scenario with multiple possible numeric answers, enhancing problem-solving and percent calculation skills. This set of problems is part of an introductory unit on percentages.