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Tax rate-

The specific percentage at which any corporation or an individual is taxed is the tax rate.

Marginal tax rate-

The specific percentage of tax taxed on the last dollar earned of taxable income by a corporation or an individual is a marginal tax.

Marginal Tax Rate = $∆$Tax Payable * 100 / $∆$Taxable Income

For Christino,

$∆$Tax Payable = $300 - $200 = $100

$∆$Taxable Income = $2000 - $1000 = $1000

by putting values into formula

Marginal Tax Rate = 100 * 100 / 1000 = 10%

Marginal Tax Rate = $∆$Tax Payable * 100 / $∆$Taxable Income

For Jarius,

$∆$Tax Payable = $400 - $200 = $200

$∆$Taxable Income = $2000 - $1000 = $1000

by putting values into formula-

Marginal Tax Rate = 200 * 100 / 1000 = 20%

Marginal Tax Rate = $∆$Tax Payable * 100 / $∆$Taxable Income

For Meg,

$∆$Tax Payable = $500 - $200 = $300

$∆$Taxable Income = $2000 - $1000 = $1000

by putting values into formula -

Marginal Tax Rate = 300 * 100 / 1000 = 30%