The total cost of a tablet device comprises the cost of material, labour and overheads in the ratio 3:4:1. The cost of material is $315. What is the total cost of the tablet?​

$840

Step-by-step explanation:

Given data

The cost of material is $315

The ratio is

3:4:1

The total number of part is

3+4+1= 8

Let us apply the part to all method

let the total cost be x

hence

3/8=315/x

cross multiply

3x= 8*315

3x= 2520

divide both sides by 3

x= 2520/3

x= $840

Hence the total money is $840

the workers who do no drive has no reasonable reason to buy gasoline due to they don't have anything to use it for