Stanislav Duris

Stanislav Duris commented on Weight of a scoop in two ice cream parlours 7 years, 4 months ago

Thank you Chris, I have used [3pt].

Stanislav Duris on Weight of a scoop in two ice cream parlours 7 years, 4 months ago

Gave some feedback: Needs to be tested

Stanislav Duris on Calculate the original price before a decrease 7 years, 4 months ago

Gave some feedback: Needs to be tested

Stanislav Duris commented on Calculate the original price before a decrease 7 years, 4 months ago

I have fixed everything. There is a different price range for every item, I made sure these are all realistic compared to the actual market right now.

All the original prices now end with .99. It would not be random enough if I still wanted the discounted price to end with .99 as well and still have integer percentages, so now, the new discounted price ends with .x9. I think this is good and realistic enough.

Stanislav Duris on Calculate a student discount 7 years, 4 months ago

Gave some feedback: Needs to be tested

Stanislav Duris commented on Calculate a student discount 7 years, 4 months ago

I've changed the percentages to be multiples of 5 and adjusted the advice.

I believe the line in the advice about not rouding can be correct. This is because in case the third decimal place of the calculated discount is 5 and all the following decimal places are zeros (so it would be xxx.xx5), we would round up and therefore subtract this rounded up value. However, the shop would technically round this down as they calculate the price by simply multiplying the original price by the percentage and they would round up there, cause they would also get 5 as the third decimal place and the rest would be zeros. So rounding the discount results in an error of 1 penny in some cases

This happened on occasions with previous percentages but seems not to happen anymore with multiples of 5 so I removed that line.

Stanislav Duris commented on Cumulative percent decrease 7 years, 4 months ago

I have changed the part b) how you suggested so it's more natural. I have also separated part c) into its own question.

Stanislav Duris on Cumulative percent decrease 7 years, 4 months ago

Gave some feedback: Needs to be tested

Stanislav Duris on Cumulative percent decrease 7 years, 4 months ago

Gave some feedback: Has some problems

Stanislav Duris commented on Exponential increase 7 years, 4 months ago

This question was originally a part c) in question Exponential increase and decrease.