Dave receives 10% commission on his first $5,000 in sales and receives 20% commission on
any sales beyond the first $5,000. If Dave sells
$7,000 this month, what will Dave's commission
be for the month?
A. $700
B. $900
C. $1,400
D. $2,100

someone please help!! i would be so thankful! thx to who ever does (hurry please)!

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.