If it took $550$ minutes to complete a hospital's first cornea transplant, and the hospital uses a $85\%$

learning rate, then, using Table E$\mathrm{.}3,$ the cumulative time to complete:

a$)$ the first $3$ transplants enter your response here

minutes $($round your response to the nearest whole number$).$

Part $3$

b$)$ the first $6$ transplants enter your response here

minutes $($round your response to the nearest whole number$).$

Part $4$

c$)$ the first $8$ transplants enter your response here

minutes $($round your response to the nearest whole number$).$

Part $5$

d$)$ the first $16$ transplants enter your response here

minutes $($round your response to the nearest whole number$).$