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Year Beg. Bal Payment Interest Principal End Bal 1 $112,500.00 $18,308.86 11,250

ID: 2709217 • Letter: Y

Question

Year

Beg. Bal

Payment

Interest

Principal

End Bal

1

$112,500.00

$18,308.86

11,250.00

$18,308.86

$94,191.14

2

94,191.14

$16,355.40

9,419.11

$16,355.40

$77,835.74

3

77,835.74

$14,589.84

7,783.57

$14,589.84

$63,245.90

4

63,245.90

$12,991.06

6,324.59

$12,991.06

$50,254.84

5

50,254.84

$11,538.88

5,025.48

$11,538.88

$38,715.96

6

38,715.96

$10,213.17

3,871.60

$10,213.17

$28,502.79

7

28,502.79

$8,991.80

2,850.28

$8,991.80

$19,510.99

8

19,510.99

$7,845.66

1,951.10

$7,845.66

$11,665.33

9

11,665.33

$6,721.45

1,166.53

$6,721.45

$4,943.88

10

4,943.88

$5,438.27

494.39

$4,943.88

$0.00

Given this stream of projected cash flows on a MBS, what rate of prepayment is assumed? State your answer as a percentage (e.g. 20.1%)

The coupon rate on the pool is 10%, payments are annual, and the column label "principal" includes both regularly scheduled prinicpal payments and prepayments.

Year

Beg. Bal

Payment

Interest

Principal

End Bal

1

$112,500.00

$18,308.86

11,250.00

$18,308.86

$94,191.14

2

94,191.14

$16,355.40

9,419.11

$16,355.40

$77,835.74

3

77,835.74

$14,589.84

7,783.57

$14,589.84

$63,245.90

4

63,245.90

$12,991.06

6,324.59

$12,991.06

$50,254.84

5

50,254.84

$11,538.88

5,025.48

$11,538.88

$38,715.96

6

38,715.96

$10,213.17

3,871.60

$10,213.17

$28,502.79

7

28,502.79

$8,991.80

2,850.28

$8,991.80

$19,510.99

8

19,510.99

$7,845.66

1,951.10

$7,845.66

$11,665.33

9

11,665.33

$6,721.45

1,166.53

$6,721.45

$4,943.88

10

4,943.88

$5,438.27

494.39

$4,943.88

$0.00

Explanation / Answer

Answer:

Year Beg. Bal Payment Interest Principal End Bal Prepayment rate 1 $112,500.00 $18,308.86 11,250.00 $18,308.86 $94,191.14 $7,058.86 6.274542222 2 94,191.14 $16,355.40 9,419.11 $16,355.40 $77,835.74 $6,936.29 7.364057808 3 77,835.74 $14,589.84 7,783.57 $14,589.84 $63,245.90 $6,806.27 8.744401993 4 63,245.90 $12,991.06 6,324.59 $12,991.06 $50,254.84 $6,666.47 10.54055678 5 50,254.84 $11,538.88 5,025.48 $11,538.88 $38,715.96 $6,513.40 12.96074169 6 38,715.96 $10,213.17 3,871.60 $10,213.17 $28,502.79 $6,341.57 16.37973074 7 28,502.79 $8,991.80 2,850.28 $8,991.80 $19,510.99 $6,141.52 21.54708364 8 19,510.99 $7,845.66 1,951.10 $7,845.66 $11,665.33 $5,894.56 30.21148594 9 11,665.33 $6,721.45 1,166.53 $6,721.45 $4,943.88 $5,554.92 47.61905578 10 4,943.88 $5,438.27 494.39 $4,943.88 $0.00 $4,943.88 100