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Total compensation for 21 system we need to find.

Option 1:
For each system he receives a fee of 25$ plus 15% commission on the selling price. Now we don't know the selling price of this system , hence option not sufficient .

Option 2:
sp of 21 totaled 52500 but here we don't get the details about commission or any other fee he received . Hence not sufficient.

Option1+2 together. Here we get the total sp of 21 is 52500 which amounts to 2500 per piece, now we know he received 25$ +15% of 2500 on each of the system. So easily we can find out from here. Hence this should be sufficient. Option C should be the answer
Bunuel
How much compensation did Nio receive for selling 21 home security systems last month?

(1) For each system that he sells, Nio receives a fee of $25 plus a 15 percent commission on the selling price.
(2) The selling prices of the 21 systems that Nio sold totaled $52,500.


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