Jawapan

2015-10-11T22:27:09+08:00
Let say the original price = y

david
= [(100 -12) /100] X y
= 0.88y

janet
= [(100 -10) /100] X y
= 0.9y

the equation;
janet = david + RM1.50
0.9y = 0.88y +1.5
0.9y -0.88y = 1.5
0.02y = 1.5
y = 1.5 /0.02
y = RM75
if my solution is 2%=1.50. 10%=1.50x 5. 10%=7.50. 100%=7.50x 10. 100%=75
like this,can ?
if you understand that way, then, it is okay for you to use that way as long as the answer is correct. :)
thank you^-^
you are welcome. :)
2015-10-12T00:48:32+08:00
David pay 100-12=88%
janet pay 100-10=90%
90-88=2%=1,5RM
100/2 × 1,5 = 75RM