1. Stating the problem: Calculate the following percentages of given numbers. 2. Formula: To find $p\%$ of a number $N$, use the formula: $$\text{Result} = \frac{p}{100} \times N$$ 3. Calculate each: - $30\%$ of $70$: $$\frac{30}{100} \times 70 = \frac{30}{100} \times 70 = 21$$ - $80\%$ of $90$: $$\frac{80}{100} \times 90 = 72$$ - $20\%$ of $120$: $$\frac{20}{100} \times 120 = 24$$ - $5\%$ of $60$: $$\frac{5}{100} \times 60 = 3$$ - $90\%$ of $70$: $$\frac{90}{100} \times 70 = 63$$ - $40\%$ of $12$: $$\frac{40}{100} \times 12 = 4.8$$ - $60\%$ of $25$: $$\frac{60}{100} \times 25 = 15$$ - $25\%$ of $36$: $$\frac{25}{100} \times 36 = 9$$ - $65\%$ of $35$: $$\frac{65}{100} \times 35 = 22.75$$ - $75\%$ of $144$: $$\frac{75}{100} \times 144 = 108$$ - $30\%$ of $15$: $$\frac{30}{100} \times 15 = 4.5$$ - $75\%$ of $36$: $$\frac{75}{100} \times 36 = 27$$ - $15\%$ of $28$: $$\frac{15}{100} \times 28 = 4.2$$ - $50\%$ of $25$: $$\frac{50}{100} \times 25 = 12.5$$ - $45\%$ of $144$: $$\frac{45}{100} \times 144 = 64.8$$ 4. Explanation: To find a percentage of a number, convert the percentage to a decimal by dividing by 100, then multiply by the number. This gives the part of the number represented by that percentage. Final answers: - 21 - 72 - 24 - 3 - 63 - 4.8 - 15 - 9 - 22.75 - 108 - 4.5 - 27 - 4.2 - 12.5 - 64.8