单项选择题
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ENROLLMENT FACULTY SIZE，FACULTY SALARY， AND TUITION AT COLLEGE R FOR SELECTED YEARS |
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| Number of Students Enrolled | 1，490 | 1，600 | 1，790 |
| Number of Faculty members | 166 | 160 | |
| Ratio of students to Faculty | — |
 |
 |
| Average* Faculty Salary | — | $14，360 | $28，400 |
| Tuition per Student | $1，400 | $2，000 | $3，700 |
| Total Faculty Salaries | $1，245，000 | — | $4.629，200 |
| Income from Tuition | $2，086，000 | $3，200，000 | — |
*Arithmetic mean
If the increase in the number of students enrolled from 1950 to 1960 was half the increase from 1960 to 1970，what was the student enrollment in 1950？（） A. 745
B. 1，340
C. 1，380
D. 1，435
E. 1，545
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