Question

mkuma bought a pen drive and clock for $1300.He sold pen drive at the profit of 20% and clock at the profit of 25%.His net profit is (231/3)%.Find the cost price of clock.

Answer 1

simultaneous equation problem
Eq.1: pen + clock = 1300
express clock as f(pen) gives:
clock = 1300 - pen

Eq. 2: pen*1.2 + clock*1.25 = 1300*1.233

Substitute clock as a f(pen):
pen*1.2 + (1300 - pen)*1.25 = 1300*1.233
1300*1.25 - 0.05pen = 1300*1.2333
1300*0.0167 = 0.05pen
pen = 1300*0.0167)/(0.05)
pen = 442
clock = 858

Answer 2

perfect

Answer 3

You can substitute the pen and clock values into Eq. 2 to double check :-)

Answer 4

not to be judgemental, but is this really in the spirit of openstudy? if somone just get the answer here, their not learning anything

Answer 5

Tried to respond with an answer to the specific question as well as an explanation of the method including checking :-)

Answer 6

okay, i suppose thats good... but just for future reference, i imagine its better to solve a paralel example instead of the origonal problem