If one store sells 12 pens for $9.00 and another sells 10 pens for $7.80, which is the better deal? if you have to buy 120 pens, how much will you save by using the less expensive supplier?

The pack of pens that has 12, is you bought 120 pens the total would be $90 but with the other pack it would cost $93.60

hope this helps!

For the first one it would be 12 for 9.00 for your 120 pen question you would times until it gets to 120 which is 12 times 10 = 120 then you would do 10 times 9 = 90.00$ then you do the same for 10 for 7.80 10 times 12= 120 then you do 12 times 7.80 = 93.60 so you would save 3.60$ more on 12 for 9.00$ than 10 for 7.80$

Element 17 is chlorine it is a group 7 element(halogen) and belongs to period 3 of the periodic table

Sry i don't know the answer but are u from kastner?