Given

Charged

+ 1

+5

+10

2.

$0.25

$0.15

2 nickels

15>20>25

or 1 dime

15>25

3.

$0.25

$0.07

3 pennies

 7 >8>9>10

then 1 nickel 

>15

 3 nickels

>15>20>25

then one dime

>25

4.

$0.50

$0.29

1 penny

29>30

2 dimes

>40>50

5.

$0.50

$0.32

3 pennies

32>33>34>35

1 nickel

>40

3 nickels

>40>45>50

1 dime

>50

6.

$0.75

$0.61

4 pennies

61>62>63>64>65

2 nickels

>75

1 dime

>75

7.

$1.00

$0.48

2 pennies

48>49>50

5 dimes

>60>70>80>90>$1

>75>$1

8.

$1.00

$0.83

2 pennies

83>84>85

1 nickel

>90

3 nickels

>90>95>$1

1 dime

>$1

9.

$1.00

$0.71

4 pennies

71>72>73>74>75

>$1

10.

$1.00

$0.96

4 pennies

96>97>98>99>$1