Okay, here are the steps to solve this problem:
* Jen earns a weekly salary of $250 
* She gets a 10% bonus on any sales 
* In the past 4 weeks, she sold $312 worth of phones and accessories 
* 10% of $312 is $31.20 
* So in 4 weeks, her bonus would be $31.20 * 4 = $124.80 
* Her weekly salary is $250 
* So in 4 weeks, her salary would be $250 * 4 = $1000 
* Her total income over 4 weeks is $1000 + $124.80 = $1124.80 
* The choices are: 
** $1,031.20 ** $562.00 ** $312.00 ** $281.20 ** $31.20 
So the correct choice is $1,031.20.