"During" is used to indicate something happening in the course of an event.
"During the lecture" means at the time the lecture is happening — correct usage here.
First discount = 20%, so 80% of price remains.
Second discount = 20% on 80%, which is 16%.
Total discount = 20% + 16% = 36%
To find the percentage, divide 210 by 480 and multiply by 100:
(210 ÷ 480) × 100 = 43.75%
79 + 69 = 148
148 + 59 = 207
207 + 89 = 296
296 + 99 = 395
Percentage = (210 ÷ 420) × 100 = 50%
Allay means to reduce or ease (fears, suffering, concerns, etc.).
It fits the context where the government should lessen the suffering of the people.
To calculate (5)^4:
(5)^4 = 5 × 5 × 5 × 5
= 625
10% of 38 = (10 ÷ 100) × 38 = 3.8
"It was a site worth seeing."
"Site" is a noun (a place or location).
"Worth seeing" is a phrase that acts like an adjective to describe the site.
The subject "Either who or he" is treated as singular because "either...or" joins two singular elements.
The verb "is" matches the singular subject — "is" is used for singular subjects.