It will be easy to solve the problem by first calculating how much money she makes in a week at her job by multiplying her hourly rate by the number of hours she works in a week: $8 * 35 = $<<8*35=280>>280 in a week
The weekly earnings need to be multiplied by the number of weeks in a month to get how much she made in a month: $280 * 4 = $<<280*4=1120>>1120
The bike’s cost must be subtracted from her earnings made in a month to get how much money is left over after purchasing the bike: $1120 - $400 = $<<1120-400=720>>720 is left over after purchasing her bike
#### 720