Data Sufficiency

Can someone pls explaing the terms

1 Gross Profit.

2 Revenues - I think it means total sales.

Pls see the question.

OA is E.

For gross profit we need to know that Revenue - Cost.

(1)
revenues was number of units * sale price: 1000*(k+60) = 150,000. that's mean that k=90. we still don't have T so we can know the Cost. insufficient.
(2)
the cost of producing 500 units:
500k + t
the cost of producing 1000 units:
1000k + t

and from the information we know that 500k + t + 45000 = 1000k + t. and that's again k=90. insufficient.

(1) & (2):
we can't still know t, so we can't compute the cost or the profits.

hence (E)