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A restaurant has a profit of $1,300 in January. The profit will increase by $150 each month for 11 months.

What will the total profit be over the 12-month period?

 

 

The first row of a section in a stadium has 10 seats. The second row has 11 seats. The third row has 12 seats. This pattern continues and the section has 24 rows.

How many seats are in this section?

jbouyer  Feb 28, 2018
 #1
avatar+88902 
+1

Note that the sum of the first n positive integers is

n (n + 1)  / 2

 

For the first one we have this :

 

Total Profit  =

 

1300  + 150 ( 1 + 2 + 3 +....+ 10 + 11) =

 

1300 + 150 [ 11 (12)] /2 =

 

1300 + 75 * (132)  =

 

$11200

 

 

The second is easier  

 

The number of seats  is  given by

 

(33 + 10) * (n/2)    where n is the number of rows  = 24  and the last row has 33 seats

 

(43) (24/2)  = 

 

43 * 12  =

 

516 seats

 

 

cool cool cool

CPhill  Feb 28, 2018

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