This is project management course question from BUS $353,$ SUSS

As the project progresses, the following issues are encountered:

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i$.$ The raise floor $($Activity $11)$ requirement is different from the initial design due to lack of the detailed floor plan. Additional work and different materials are required. Two $(2)$ additional days and an additional amount of $$3,000$ are required. As it is an oversight of MOD, USB will not pay for this additional cost.

ii$.$ Due to the appreciation of Japanese Yen, the $$Supervise subcontractor on supply and install aircon$($Activity $14)$ costs $10\%$ more.

iii.$$ USB has just purchased a new bank equipment which needs customisation. The duration of $$Customise banking equipment$($Activity $5)$ has to be increased by three $(3)$ days.

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This requirement was not stated in the contract. USB agreed to pay for the additional work, but need the branch hand over date to remain on $3$ September $2024.$ You need to increase Activity $5$s duration by $3$ days and request Mary to work on weekday, Saturday and$/$or Sunday when necessary to meet the deadline. Mary agreed despite her disappointment. Make a decision on the dates.

Since the equipment causing the change is not in the contract, the cost will be charged separately to USB. MOD management wants the Cost Performance Index $($CPI$)$ to be based on the baselined cost. Hence, leave the Activity $15$ cost unchanged.

For the activities that has additional days, do I set them as "increse work but keep hours reseource work per day $($units the same or decrease the hour resources work per day $($units$)$ but keep the same amount of work?