return of capital and interest

Kindly I need some help on the following… I struggle to figure out how the following return of capital and interest is being calculated:

Examples:

Simple interest: £10,000 @ 5% for 3 years.
Year 1: £500 (£10,000 x 5%)
Year 2: £500 (£10,000 x 5%)
Year 3: £500 (£10,000 x 5%), in year 3. Return of capital and interest = £11,500

Compound interest: £10,000 @ 5% for 3 years compound.
Year 1: £500 (£10,000 x 5%)
Year 2: £525 ((£10,000 + £500) x 5%)
Year 3: £551.25 ((£10,000 + £500 + £525) x 5%) in year 3 return of capital and interest = £11,576.25

These are the answers I got from one of my resources. However, it’s not quite clear to me where the final figures £11,500 and £11,576.25 came from? How are they calculated?

Please note, I am a beginner, thanks for your help in advance