An amount of $4,000 is invested the interest rate is 2% what is the month and 1 year

The interest for a month is $6.66 and 1 year is $80.

Explanation:

Simple Interest = Pnr/100

where,

⇒ P = principal

⇒ n = number of years

⇒ r = rate

Interest for 1 year,

P = $4,000, n = 1, r = 0.02

Interest = 4000 1 0.02

⇒ $80

Interest for 1 month,

⇒ divide the 1 year interest by 12,

⇒ 80/12

⇒ $6.66

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )