As a salesperson at roaring waves beach supplies, carissa receives a monthly base pay plus commission on all that she sells. if she sells $500 worth of merchandise in one month, she is paid $385. if she sells $1,000 of merchandise in one month, she is paid $470.

find carissa's salary when she sells $1,900 worth of merchandise.

$623

Step-by-step explanation:

Let us suppose that the

Earning = y

Fixed payment = c

Commission paid = m per unit

Case 1.

When 500 units are sold, Earning y = $385

Earning = Fixed Payment + Commission paid per unit * Number of units

385=c+m*500

385=c+500m   ________(a)

Case 2.

When 1000 units are sold  earning y = $470

Earning = c+m*1000

470=c+1000m _________(b)

Subtracting (a) from (b) we get

85=500m

Putting this value of m in (a)

385=c+85

c=300

Hence the fixed payment is $300 and the commission given is $0.17 per unit

Case 3 :

Number of Units sold = 1900

Earning = 300+0.17*1900

Earning = 300+323

Earning = 623

Hence The earning will be $623

what's the question here?