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, , , , , ( ). : , , , , :

+ = ,

= / ( - )

.

1. . , () 2100 ., , () - 1050 ., , () 15000 . , 15000/ (2500 1050) = 14 . -

(, 25, 40 ) .

2. . , 1 , , 20 , , .

= ( + )/

 

= (20 . 1050 . + 15 000 .) /20 . = 1800 .

, 1800 . , 20 .

3. . , $21 000, 155 . 100 7 $ , , , $4900. 55 (155 ) $ 11 . , $260).

. ($21000), - ($4900) , , . ( = 21 000 + 4900 = $25 900). , , . , ( ) 100 ( ) . ($11 7 = $77) , . , = ( 100) 77. , $10 , ( = $250), :

( - 100) $77 + $25 900 = $250,

 

= 105.

, , 105 . , ($21 000), ($4900), 5 ! ($385).

4. , , , $29 000. - ( ) $130 . 106 ( 155 ). 12 %.

. ($29 000), ( ) - = $130, ( ) = 106 . , :

= ( + )/, = $403.

12 %, 119 , 13 . 13 ( 106 ). , 13 $403 - $130 = $273, 13 273 = 3549 $.

5. ( 10 ) (). - 3 160 , $11 . -154, 160 , - $27 000. 35 %. 10 %.

. , ( , ). , = $27 000 + ($11 160 ) = $44 600, .

(160 .), :

= (( ) + )/, =

= /

= 44600$/160 . = $279.

(35%), () $377, (10 %) $419.

- ($377) :

= /, = 44 600/377 = 119 .





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