how to calculate the trasnaction fee

[prologic-dev]

How to calculate the trasnction fee with the following array

btc: [{
name: 'urgent',
nbBlocks: 2,
multiplier: 1.5,
defaultValue: 150000,
}, {
name: 'priority',
nbBlocks: 2,
defaultValue: 100000
}, {
name: 'normal',
nbBlocks: 3,
defaultValue: 80000
}, {
name: 'economy',
nbBlocks: 6,
defaultValue: 50000
}, {
name: 'superEconomy',
nbBlocks: 24,
defaultValue: 20000
}]