Mackenzie is saving for a $400 for a gaming systems. she has saved 25% of the money so far. how much more does mackenzie need to save?

Can any one me with the answers to these questions asap?

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

Write and solve a real word problem that involves determining distance on a coordinate plane