Answer :

Alright! Let's break this problem down step by step to find out how to decrease £220 by 15%.

1. First Step: Calculate the Decrease Amount

We need to find what 15% of £220 is. Remember that to find a percentage of a number, you can multiply the number by the percentage (expressed as a decimal).

[tex]\[ \text{Decrease Amount} = \left(\frac{15}{100}\right) \times 220 \][/tex]

Evaluating this:

[tex]\[ \text{Decrease Amount} = 0.15 \times 220 = 33.0 \][/tex]

Therefore, the amount of decrease is £33.0.

2. Second Step: Subtract the Decrease Amount From the Initial Amount

Now, we subtract the decrease amount from the initial amount to find the new amount.

[tex]\[ \text{New Amount} = 220 - 33.0 \][/tex]

Evaluating this:

[tex]\[ \text{New Amount} = 187.0 \][/tex]

Thus, the new amount after decreasing £220 by 15% is £187.0.

Summary:

- The decrease amount is £33.0.
- The new amount is £187.0.