B. after a 25% discount, the price of a t-shirt was $12. what was the price before
the discount?
c. compared to last year, the population of boom town has increased by 25%. the
population is now 6,600. what was the population last year?
**key takeaway:

The price before  the discount is $ 16

The population last year is 5280

B) After a 25% discount, the price of a T-shirt was $12. What was the price before  the discount?

Given that after a 25% discount, the price of a T-shirt was $12.  

We have to find what was the price before the discount?  

Now, we know that,

original price – discount = selling price

Original price – 25% of original price = $12

Let the original price be "a"

Thus the original price is $ 16

C) Compared to last year, the population of Boom Town has increased by 25%. The  population is now 6,600. What was the population last year?

Last year population + 25% of last year population = present population.

Thus the last year population is 5280

After a 25% discount, the price of a T-shirt was $12 then the price before  the discount is $16, and the population of Boom Town has increased by 25%. The  population is now 6,600 so, the population last year is 5280 and this can be determined by using the unitary method.

B)

Given:  

After a 25% discount, the price of a T-shirt was $12.

By using the unitary method the price of the T-shirt before the discount can be determined.

Given that after a 25% discount, the price of a T-shirt was $12 so, the price of $12 is 75%. Therefore, the price of the T-shirt before the discount is:

= $16

C)

Given -

Given that the population is increased by 25% that means the population of 6600 is 125% of the population of last year. Therefore, the population of last year will be:

= 5280

The population of the last year is 5280.

For more information, refer to the link given below:

link

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step-by-step explanation: