Step-by-step explanation:
she gets $195 per week plus 3% on sale OVER $1000.
ok. so, her weekly sales were $7800.
that means we need to calculate 3% of ... $6800 !
as she gets the commission only on sales that are over $1000.
6800 = 100%
1% = 100%/100 = 6800/100 = 68
3% = 1%×3 = 68×3 = $204
so, she earned $195 + $204 = $399 per week
and as there are 52 weeks per year, she then earned
399×52 = $20,748 per year.