Last week I had a meeting of 10 people and this week I expect 20% more will attend. One Lightning per person. Thank you

To find out how many people will attend the meeting this week, first calculate 20% of the current attendance of 10 people:

1. Calculate 20% of 10:

( 20% text{ of } 10 = frac{20}{100} times 10 = 2 )

2. Add this to the current number of attendees:

( 10 + 2 = 12 )

So, you can expect 12 people to attend the meeting this week, and with one Lightning required per person, you will need 12 Lightnings.