Seeking to find gainful part-time employment, Diana is choosing between two job offers. The first, a sales position at a department store, pays a flat salary of $20 per hour. As Diana plans to work 80 hours per month, she expects to earn $1,600 per month. The second job, at a stereo store, pays a monthly salary of $1,000 for a half-time position (20 hours per week or 80 hours per month) plus commissions. The store manager informs Diana that, on average, half-time salespeople earn commissions of $500 per month. Diana estimates that, regardless of the position taken, she will incur about $200 in travel costs per month. Diana currently shares an apartment with three friends. Her share of the rent and utilities is $500 per month. Study the choices given below and choose the choice that is correct