Light manufacturers produces energy-efficient light bulbs. in one 8-hour shift, they incur the following costs to make 4,000 light bulbs: use 250 lbs. of glass for a total cost of $1,016. use 500 lbs. of coal to keep the fire going to melt and shape glass for a total cost of $1,280. use 8,000 filaments for a total cost of $1,120. use 4,800 feet of wire for a total cost of $156. use 4,000 light bulb bases for a total cost of $1,480. use 128 man-hours for a total cost of $2,500. what are the direct material costs for making one light bulb?
a : $0.943.
b : $0.904.
c : $1.224.
d : $1.263.

ok

step-by-step explanation:

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

the answer is ! ?