Henry ford sells auto parts at ricarts. he gets 5% commission on the first $5000 in sales, 7% on the next $7000 and 9% on anything over $12000 last month he sold $20000.How much commission did he receive?
A. 1492
B. 1460
C. 1520
D. 1620

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

Acompany charges $0.10 for each letter engraved. bobby plans to spend no more than $5.00 on the engraving on a jewelry box. write and solve an inequality to find the maximum number of letters he can have engraved.