well i need to get over 55% to not do an exam

i got 65% in an assingment worth 15%

55% in an assingment worth 15%

92% in an assingment worth 5%

42% in an assingment worth 5%

All that adds up to 40% of the grade so far, the exam is 50%

i still have a test worth 10%.

how can i work this out?

## Answers (2)

65% of 15% + 55% of 15% + 92% of 5% + 42% of 5%

=> 65/100 * 15 + 55/100 * 15 + 92/100 * 5 + 42/100*5

=> 13*3/4 + 11*3/4 + 23/5 + 21/10

=> 39/4 + 33/4 + 23/5 + 21/10

=> 9.75 + 8.25 + 4.6 + 2.1

=> 18 + 6.7

=> 23.7 out of the total 40%

which is 23.7/40 * 100 = 2370/40 = 237/4 = 57.4%

you can multiply what you got with how much it's worth for each assignment, and it it all up:

0.65*0.15 + 0.55*0.15 + 0.92*0.05 + 0.42*0.05

= 0.0975 + 0.0825 + 0.046 + 0.021

= 0.247

but this is out of 40%, or 0.4, so your percentage would be

0.247 / 0.4

= 0.6175

and 0.6175 = 61.75% so you got over 55%