The computer store sells disks ($1.50) and boxes of computer paper ($2). if total sales were $5,050 and customers bought 7 times as many diskettes as boxes of computer paper, how many diskettes were sold

Let the number of computer papers bought be x, the number of disk bought will be 7x.
cost of each disk is $1.50
cost of each computer paper is $2
The total cost will be given by:
Amount=(cost of disk*number of disk)+(cost of computer paper*number of papers)
Amount=5050=1.5(7x)+2(x)
5050=10.5x+2x
5050=12.5x
x=5050/12.5
x=404
the number of computer papers sold was 404 and the number of diskettes sold was 404*7=2828

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